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USNS Mission Buenaventura (T-AO 111) on date
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Class: MISSION BUENAVENTURA (T-AO 111)
Design: SCB, MC/MA, Navy XX #
Displacement (tons): #,###
Dimensions (feet): ###.#' x ##.#' x ##.#'
Original armament: 4-5"/38
Later armaments: (19xx) 4-20mm
Complement: ###
Speed (kts.): ##.#
Propulsion (HP): #,###
Machinery: turbines, # screw

Construction:
T-AONameAcqBuilderKeelLaunchSvc
111MISSION BUENAVENTURA18 Nov 1947Marinship29 Mar 194428 May 194418 Nov 1947
112MISSION CAPISTRANO17 Nov 1947Marinship29 Feb 19447 May 194417 Nov 1947
113MISSION CARMEL21 Oct 1947Marinship1 Jan 194428 Mar 194421 Oct 1947
114MISSION DE PALA22 Oct 1947Marinship26 Nov 194328 Feb 194422 Oct 1947
115MISSION DOLORES20 Oct 1947Marinship13 Feb 194426 Apr 194420 Oct 1947
116MISSION LORETO20 Nov 1947Marinship27 Apr 194428 Jun 194420 Nov 1947
117MISSION LOS ANGELES24 Oct 1947Marinship25 Apr 194510 Aug 194524 Oct 1947
118MISSION PURISIMA15 Oct 1947Marinship10 Jun 194325 Aug 194315 Oct 1947
119MISSION SAN ANTONIO22 Oct 1947Marinship15 Jan 19448 Apr 194422 Oct 1947
120MISSION SAN CARLOS12 Nov 1947Marinship1 Nov 194312 Feb 194412 Nov 1947
121MISSION SAN DIEGO17 Oct 1947Marinship20 Dec 194314 Mar 194417 Oct 1947
122MISSION SAN FERNANDO21 Oct 1947Marinship26 Aug 194325 Nov 194321 Oct 1947
123MISSION SAN FRANCISCO28 Oct 1947Marinship5 May 194518 Sep 194528 Oct 1947
124MISSION SAN GABRIEL14 Oct 1947Marinship31 Jan 194417 Apr 194414 Oct 1947
125MISSION SAN JOSE5 Nov 1947Marinship17 Jul 19437 Oct 19435 Nov 1947
126MISSION SAN JUAN21 Nov 1947Marinship30 Jul 194314 Oct 194321 Nov 1947
127MISSION SAN LUIS OBISPO24 Oct 1947Marinship18 Apr 194418 Jun 194424 Oct 1947
128MISSION SAN LUIS REY23 Oct 1947Marinship15 Oct 194329 Jan 194423 Oct 1947
129MISSION SAN MIGUEL4 Nov 1947Marinship11 Aug 194331 Oct 19434 Nov 1947
130MISSION SAN RAFAEL21 Oct 1947Marinship25 Sep 194331 Dec 194321 Oct 1947
131MISSION SANTA BARBARA20 Oct 1947Marinship8 Apr 19448 Jun 194420 Oct 1947
132MISSION SANTA CLARA5 Nov 1947Marinship15 Mar 194418 May 19445 Nov 1947
133MISSION SANTA CRUZ24 Oct 1947Marinship26 Jun 19438 Sep 194324 Oct 1947
134MISSION SANTA YNEZ22 Oct 1947Marinship9 Sep 194319 Dec 194322 Oct 1947
135MISSION SOLANO20 Oct 1947Marinship8 Oct 194314 Jan 194420 Oct 1947
136MISSION SOLEDAD16 Oct 1947Marinship12 Jul 194328 Sep 194316 Oct 1947
137MISSION SANTA ANA9 Jan 1948Marinship18 Apr 194525 Jul 19459 Jan 1948

Disposition:
T-AONameTInactStrikeDisposalFateMA Sale/Depart
111MISSION BUENAVENTURAT197231 Mar 19729 Mar 1972MA26 Jun 1973
112MISSION CAPISTRANOT197019 Oct 19711 Sep 1971MA10 Jul 1972
113MISSION CARMELT195725 Oct 195725 Oct 1957MA29 May 1967
114MISSION DE PALAT195813 Mar 195813 Mar 1958MA--
115MISSION DOLOREST195719 Sep 195719 Sep 1957MA18 Apr 1969
116MISSION LORETOT195916 Jul 195916 Jul 1959MA2 Sep 1975
117MISSION LOS ANGELEST195913 Aug 195913 Aug 1959MA2 Dec 1975
118MISSION PURISIMAT19574 Dec 19574 Dec 1957MA27 Apr 1976
119MISSION SAN ANTONIOT11 Jan 196511 Jan 196511 Jan 1965MA9 Jun 1965
120MISSION SAN CARLOST19576 Nov 19576 Nov 1957MA16 May 1966
121MISSION SAN DIEGOT195716 Oct 195716 Oct 1957MA10 Nov 1966
122MISSION SAN FERNANDOT19574 Sep 19574 Sep 1957MA--
123MISSION SAN FRANCISCOT195720 Mar 19575 Mar 1957Lost--
124MISSION SAN GABRIELT195720 Dec 195720 Dec 1957MA24 Jun 1966
125MISSION SAN JOSET195715 Oct 195715 Oct 1957MA24 Jun 1966
126MISSION SAN JUANT195812 Feb 195812 Feb 1958MA--
127MISSION SAN LUIS OBISPOT195724 Sep 195724 Sep 1957MA25 Mar 1966
128MISSION SAN LUIS REYT195719 Nov 195719 Nov 1957MA7 Nov 1972
129MISSION SAN MIGUELT195720 Dec 19579 Oct 1957Lost--
130MISSION SAN RAFAELT28 Apr 197028 Apr 197023 Jan 1970MA25 Jun 1971
131MISSION SANTA BARBARAT19578 Nov 19578 Nov 1957MA25 Mar 1966
132MISSION SANTA CLARAT196231 May 197417 Jan 1963Trf--
133MISSION SANTA CRUZT15 Sep 197015 Sep 197025 Jun 1971MA/S--
134MISSION SANTA YNEZT21 Oct 19831 Nov 199020 Oct 1992MA/T15 Jan 2010
135MISSION SOLANOT195715 Aug 195715 Aug 1957MA26 May 1967
136MISSION SOLEDADT195731 Oct 195731 Oct 1957MA4 Nov 1966
137MISSION SANTA ANAT195825 Feb 195825 Feb 1958MA2 Dec 1975

Class Notes:
During mid-1942 tanker sinkings in the Atlantic were exceeding the rate of new construction, and in response the MC added several tanker yards to its emergency shipbuilding effort. On 27 Jul 1942 the MC informed one of its yards then building Liberty ships, Marinship in Sausalito, Calif., that it would be converted to tanker construction. The MC issued an order for 22 turbo-electric T2 tankers to Marinship on 9 Oct 1942. The factories producing the 6,000 hp propulsion plants for the T2-SE-A1 tankers were already producing at peak capacity, but it was determined that the General Electric Co. would be able to furnish 10,000 hp units in time to meet the launching schedules at Marinship. The 10,000 hp plant had been developed for the ten P2-SE-A1 type troop transports (the AP-120 class) then on order at the nearby Bethlehem Steel Co. Alameda shipyard. Marinship was instructed to fit the larger plant into its tankers, designated T2-SE-A2, while retaining as much of the T2-SE-A1 design as possible. The MC made the problem even harder by adding a bulkhead in the engineering spaces. As a result the bilge, fire and water pumps and the main thrust bearing, which had been conveniently located together aft of the lower engine room space, had to be squeezed in beside the propeller shaft and in front of the main propulsion motor, producing very crowded machinery spaces. Other major design changes were also made to the engineering plant, including the use of high-pressure high-temperature boilders with special alloy fittings. A benefit of the change was that the A2's had a designed speed of 16 knots instead of the 14.5 knots of the A1's.

In the postwar economic boom the Navy was unable to buy all of the oil it needed from its former domestic suppliers and had to transport large quantities from the Persian Gulf. In October 1947 it asked the Maritime Commission for 50 T2 tankers to be operated by the Navy with civilian crews. On 7 Oct 1947 it asked for 26 T2-SE-A2 tankers which had been laid up in 1946 after civilian war service. These were delivered in October-November 1947 and became AO 111-136. On 20 Oct 1947 it asked for the return and reconversion for civilian operation of 24 former Navy tankers, 14 T2-SE-A2's of the AO-80 and AO-101 classes and 10 T2-SE-A1's of the AO-49 class. During October 1947 the MC transferred these 24 tankers from the reserve fleets to commercial firms acting as operating agents, presumably to oversee the movement of the ships to shipyards and their reactivation. When reactivation was complete in January-March 1948 the MC transferred ownership of the vessels to the Navy. When PONAGANSET (AO-86) broke in half during reconversion the MC replaced her with AO-137. The Navy ultimately obtained all but one of the Marinship T2-SE-A2 and T2-SE-A3 type tankers (including AO 80-88, 91-96, and 101), the exception being MISSION SANTA MARIA (MC hull 1825), which grounded off the coast of Florida in 1946 and was sold for commercial use later that year as SS CYRUS. (She lasted to 1972.)

On 25 Mar 1948 the Navy informed the MC that the 50 tankers would be inadequate to meet the increased requirements of the armed services and asked for five more T2s and one T1. It received the civilian AO 138-142 and the former Naval AOG 68 between April and July 1948. The Navy listed these 56 ships as "U.S. Naval Tankers" in the Naval Vessel Register separately from the commissioned "oilers - fuel oil tankers." The U.S. Naval Tankers (USNT) were Navy-owned tankers manned by civilian crews of about 9 officers and 39 men. They were assigned to the Naval Transportation Service (NTS) and were operated by four civilian firms acting as operating agents: Marine Transport Lines, Inc. (New York), Pacific Tankers, Inc. (San Francisco), American Pacific Steamship Co. (San Pedro), and Tankers Company, Inc. (New York). The 32 ships acquired from the merchant marine retained their commercial names and their Navy AO numbers were "temporarily assigned for BuShips accounting purposes only," the two groups of AOs in alphabetical order of their civilian names, while the 24 former Navy ships continued to be coded in the Naval Vessel Register as "stricken" while they were in use as U.S. Naval Tankers.

All of the U.S. Naval Tankers were transferred to the new Military Sea Transportation Service (MSTS) on 1 Oct 1949 and, like all other civilian-manned MSTS ships, were redesignated "U.S. Naval Ships" (USNS). AO 112-114, 116, 124, 126, 129, and 133 were inactivated upon receipt by MSTS in November-December 1949 but were soon reactivated for the Korean War. The naval tankers became one of the three major components of the new MSTS, the others being the commissioned cargo ships and oilers of the Naval Transportation Service and the personnel transports of the Army Transportation Service. On 22 Feb 1950 CNO approved the assignment of the status "Active, In Service" for all non-commissioned vessels assigned to MSTS, including the former naval tankers with civilian crews. However, of the non-commissioned ex-Navy tankers then in operation under MSTS, 14 T2s and 1 T1 were being coded in the "Naval Vessel Register" as "stricken," a holdover from their USNT status. The Secretary of the Navy resolved this technical conflict by promulgating a letter on 28 Apr 1950 formally reinstating them on the "List of Naval Vessels." The same situation applied to nine more ex-Navy T2s (3 AO 49 class and 6 AO 80 class) that had been operated with civilian crews until they were inactivated in late 1949; these were restored to the list on 20 Mar 1950.

In 1978 the navy created the new classification symbol AOT, "Transport Oiler," for the tankers (all in MSC) that carried oil from point to point rather than delivering it to fleet units. On 30 Sep 1978 the six surviving units of the AO-49 class, all by then in reserve, were classified AOT.

The Marinship tankers listed here had a small funnel through MC hull 1815 plus MC hull 1817, the later units including MC hull 1816 had a larger funnel. AO 114, 122, and 126 are included in these tables for completeness but were converted to AGMs and their later service is covered fully in that section.

Ship Notes:
T-AONameMANotes
111MISSION BUENAVENTURA1821Completed 28 Jun 1944. Active in MSTS 1 Oct 1949. In USN reserve Sep 1954 to Oct 1956. To MA custody 4 Apr 1960, to MA (permanent) 1 Apr 1961, stk. 1 Jul 1961. From MA 10 Nov 1961, reinst. Nov 1961. To MA custody 10 Mar 1972. To buyer 13 Dec 1973.
112MISSION CAPISTRANO1819Completed 14 Jun 1944. Active in MSTS 18 Jul 1950. To MA custody 10 Jan 1955, stk. 22 Jun 1955 (est), from MA and reinst. 5 Jul 1956. Reclas AG 162 1 Jul 1960. To MA custody 15 Sep 1970. To buyer 7 Dec 1972. Converted to drilling rig after MA sale.
113MISSION CARMEL1815Completed 17 May 1944. Active in MSTS 18 Jul 1950. Merc. HOUSTON (container ship) 28 Oct 1967. Sold 30 Sep 1983 to BU.
114MISSION DE PALA1280Completed 22 Apr 1944. Active in MSTS 21 Jul 1950. To MA custody 15 Nov 1954, stk. 22 Jun 1955, from MA custody and reinst. 6 Jul 1956. To USN from MA 19 Oct 1964 as T-AGM 20, q.v.
115MISSION DOLORES1818Completed 31 May 1944. Active in MSTS 31 Jul 1950. To MA 30 Mar 1955, stk. 22 Jun 1955, from MA and reinst. 27 Jun 1956. To buyer 21 Apr 1969. Merc. TAMPA (container ship) 30 Oct 1969. BU ca. 1984.
116MISSION LORETO1824Completed 22 Jul 1944. Active in MSTS 18 Jul 1950. To MA and stk. 25 Aug 1955, from MA and reinst. 25 Jun 1956. [Struck again 1 Feb 1972.] To buyer 29 Sep 1975.
117MISSION LOS ANGELES2699Originally USS CONECUH (AO 103, T2-SE-A3 type), cancelled as such 18 Aug 1945 and completed 29 Oct 1945. Active in MSTS 1 Oct 1949. To MA for berthing 12 Nov 1957 to 22 May 1958. To buyer 2 Jan 1976.
118MISSION PURISIMA1268Completed 23 Nov 1943. Active in MSTS 31 Jul 1950. To MA 16 May 1955, struck 22 Jun 1955, from MA and reinstated 26 Jun 1956.
119MISSION SAN ANTONIO1816Completed 24 May 1944. Active in MSTS 31 Jul 1950. To MA 22 Nov 1954, stk. 22 Jun 1955 (est), from MA and reinst. 6 Jul 1956. To MA for berthing 7 Nov 1957 to 21 May 1958 and in MA custody 16 Dec 1959 to 9 Jun 1960. Merc. TRANSARCTIC (bulk) 27 Aug 1965, SEATRAIN SAN JUAN Sep 1966, SAN JUAN (in MA reserve) 8 Aug 1978, sold 1 Aug 1983 to BU, to buyer 26 Oct 1983.
120MISSION SAN CARLOS1279Completed 15 Apr 1944. Active in MSTS 31 Jul 1950. In USN reserve 1 Dec 1954 to 16 Oct 1956. Merc. SEATRAIN MARYLAND 16 May 1966, converted to vehicle ship Apr 1967 retaining stern, MARYLAND (in MA reserve) 8 Aug 1978, deleted ca. 1984.
121MISSION SAN DIEGO1814Completed 30 Apr 1944. Active in MSTS 1 Oct 1949. To MA 30 Dec 1954 [not 3 Oct 1954], stk. 22 Jun 1955, from MA and (est) reinst. 3 Jul 1956. Stern to merc. SEATRAIN WASHINGTON (container ship) 4 Nov 1966, WASHINGTON (in MA reserve) 27 May 1977, then two Reforger exercises as such 1977 and 1980.
122MISSION SAN FERNANDO1274Completed 29 Feb 1944. Active in MSTS 31 Jul 1950. To MA custody 24 May 1955, stk. 22 Jun 1955, from MA custody and reinst. 21 Jun 1956. To USN from MA 28 Sep 1964 as T-AGM 19, q.v.
123MISSION SAN FRANCISCO2700Originally USS CONTOCOOK (AO 104, T2-SE-A3 type), cancelled as such 18 Aug 1945 and completed 11 Oct 1945. Active in MSTS 1 Oct 1949. In USN reserve 18 Jan 1954 to 20 Oct 1956. Lost 1957 in collision with Liberian merc. ELNA II and ensuing explosion in the Delaware River.
124MISSION SAN GABRIEL1817Completed 27 May 1944. Active in MSTS 18 Jul 1950. In USN reserve 31 Mar 1954 to 1 Nov 1956. Merc. DELAWARE 24 Jun 1966, to buyer 28 Jun 1966. SEATRAIN DELAWARE (container ship) 21 Nov 1966, DELAWARE (in MA reserve) 8 Aug 1978), sold 1 Aug 1983 to BU, to buyer 16 Oct 1983.
125MISSION SAN JOSE1271Completed 29 Jan 1944. Active in MSTS 31 Jul 1950. Merc. OHIO 24 Jun 1966, SEATRAIN OHIO (container ship) 28 Aug 1967, OHIO (in MA reserve) 8 Aug 1978. Retained by MA as Service Craft SSE-518 (warehouse) to 1990.
126MISSION SAN JUAN1272Completed 31 Jan 1944. Active in MSTS 18 Jul 1950. In USN reserve 28 Jan 1954 to 20 Oct 1956. To USN from MA 28 Oct 1964 as T-AGM 21, q.v.
127MISSION SAN LUIS OBISPO1823Completed 15 Jul 1944. Active in MSTS 1 Oct 1949. To MA 9 Nov 1954, stk. 22 Jun 1955, from MA and reinst. 27 Jun 1956. Merc. SEATRAIN PUERTO RICO Mar 1966 (to buyer 1 Apr 1966, converted to partial container ship Jul 1966), PUERTO RICO (in MA reserve) 27 May 1977, BU 1986.
128MISSION SAN LUIS REY1278Completed 31 Mar 1944. Active in MSTS 1 Oct 1949. To MA 6 May 1955, stk. 22 Jun 1955, from MA and reinst. 22 Jun 1956. [Struck again 1 Feb 1972.] To buyer 18 Dec 1972.
129MISSION SAN MIGUEL1273Completed 19 Feb 1944. Active in MSTS 18 Jul 1950. In USN reserve 28 May 1954 to 1 Nov 1956. Wrecked on Laysan Is. Reef, Hawaii, at full speed while enroute from Guam to Seattle in ballast.
130MISSION SAN RAFAEL1276Completed 22 Mar 1944. Active in MSTS 1 Oct 1949. To MA 2 Feb 1955, stk. 22 Jun 1955, from MA and reinst. 20 Jun 1956. To MA custody 20 Aug 1959, from MA 31 May 1960. To MA custody 15 Jan 1970. To buyer 12 Jul 1971.
131MISSION SANTA BARBARA1822Completed 8 Jul 1944. Active in MSTS 31 Jul 1950. In USN reserve 12 Apr 1954 to 1 Nov 1956. Merc. SEATRAIN CAROLINA Mar 1966 (to buyer 7 Apr 1966), merc. CAROLINA (in MA reserve) 8 Aug 1978, deleted 1984.
132MISSION SANTA CLARA1820Completed 21 Jun 1944. Active in MSTS 1 Oct 1949. To MA custody 25 Jun 1959, to MSTS 30 Nov 1959 to 22 Dec 1959, to MA (permanent) 1 Apr 1961, stk. 1 Jul 1961. Reinst. 1 May 1962, from MA 10 May 1962. Transferred to Pakistan as DACCA Nov 1962, sold May 1974.
133MISSION SANTA CRUZ1269Completed 31 Dec 1943. Active in MSTS 18 Jul 1950. To MA 23 Nov 1954, stk. 22 Jun 1955 (estimated), from MA custody and reinst. 10 Jul 1956. In Navy custody 4 Dec 1959 to 31 May 1960 and 6 Oct 1970 to 25 Jun 1971. To buyer 8 Sep 1971.
134MISSION SANTA YNEZ1275Completed 13 Mar 1944. Active in MSTS 1 Oct 1949, continuous MSTS service to 1975. FRAM II overhaul 1964. To MA custody 6 Mar 1975, to MA (permanent) 1 Jul 1976. To AOT 30 Sep 1978. Title to MA 20 Oct 1992. Departed reserve fleet 31 Mar 2010, BU completed 20 Sep 2010.
135MISSION SOLANO1277Completed 30 Mar 1944. Active in MSTS 31 Jul 1950. To buyer 1 Jun 1967. Merc. JACKSONVILLE Dec 1967 and converted to container ship. BU 1983.
136MISSION SOLEDAD1270Completed 16 Jan 1944. Active in MSTS 31 Jul 1950. To buyer under exchange program 29 Dec 1966. Merc. SEATRAIN CALIFORNIA 7 Nov 1966, TRANSONTARIO 21 Feb 1967. BU 1979.
137MISSION SANTA ANA2698Originally USS CONCHO (AO 102, T2-SE-A3 type), cancelled as such 18 Aug 1945 and completed 25 Oct 1945. Acquired in place of AO-86 when the latter broke in half. Active in MSTS 3 Apr 1950. To MA 27 Jan 1955, stk. 22 Jun 1955, from MA and reinst. 3 Jul 1956. [Struck again 1 Aug 1974: SAC-12] To buyer 6 Jan 1976.

Page Notes:
Compiled: 18 Sep 2021
© Stephen S. Roberts, 2021
Sources: DB, Maroon, VSC, NVR