Quick Links Menu.



USS Protector (AGR 11).
Click on this photograph for links to larger images of this class.

Class: GUARDIAN (AGR 1)
Design: SCB Project No. 126, conversion of MC Z-EC2-S-C5
Displacement (tons): 8,760 light (including permanent ballast), 10,760 full
Dimensions (feet): 442' oa, 416' pp x 57' e x 27' max nav
Armament: 2-3"/50S (one on the bow and one on the stern)
Accommodations: 13 officers, 124 enlisted
Speed (kts.): 11
Propulsion (HP): 2,500
Machinery: Steam triple expansion reciprocating, 2 boilers (220psi/450deg), 1 screw

Construction:
AGRNameAcqBuilderKeelLaunchComm
1GUARDIAN3[5] Jun 1954J A Jones, Panama City20 Mar 19458 May 19451 Feb 1955
2LOOKOUT17 Aug 1954J A Jones, Panama City5 Apr 194524 May 19455 Mar 1955
3SKYWATCHER20[22] Sep 1954J A Jones, Panama City30 Nov 194416 Jan 194529 Mar 1955
4SEARCHER14[15] Sep 1954J A Jones, Panama City11 Dec 194423 Jan 19452 Apr 1955
5SCANNER10 Jun 1955J A Jones, Panama City24 Jan 194527 Feb 194530 Jan 1956
6LOCATOR9 Jun 1955J A Jones, Panama City9 Feb 194523 Mar 194521 Jan 1956
7PICKET11 Jul 1955J A Jones, Panama City28 Mar 194517 May 19458 Feb 1956
8INTERCEPTOR28 Jun 1955J A Jones, Panama City10 Jul 194512 Sep 194515 Feb 1956
9INVESTIGATOR8 May 1956J A Jones, Panama City28 Nov 19449 Jan 194516 Jan 1957
10OUTPOST22 May 1956J A Jones, Panama City14 Apr 19458 Jun 19456 Feb 1957
11PROTECTOR4 Jun 1956J A Jones, Panama City31 Jan 194515 Mar 194520 Feb 1957
12VIGIL11 Jun 1956J A Jones, Panama City14 Dec 194427 Jan 194528 Sep 1958
13INTERDICTOR7 May 1957J A Jones, Panama City18 May 194529 Jun 19457 Apr 1958
14INTERPRETER3 Jun 1957J A Jones, Panama City5 Jan 19458 Feb 194529 Sep 1958
15INTERRUPTER/TRACER21 May 1957J A Jones, Panama City24 Dec 194431 Jan 194516 Oct 1958
16WATCHMAN2 Apr 1958J A Jones, Panama City17 Jan 194520 Feb 19455 Jan 1959

Disposition:
AGRNameTDecommStrikeDisposalFateMA Sale/Depart
1GUARDIAN28 Jul 19651 Sep 19654 Feb 1966MA23 Nov 1970
2LOOKOUT12 Jul 19651 Sep 19654 Feb 1966MA23 Nov 1970
3SKYWATCHER29 Mar 19651 Apr 196530 Mar 1965MA23 Dec 1970
4SEARCHER1 Jul 19651 Jul 19651 Jul 1965MA7 Aug 1970
5SCANNER21 Jul 19651 Sep 19654 Feb 1966MA3 Oct 1974
6LOCATOR9 Aug 19651 Sep 19654 Feb 1966MA3 Oct 1974
7PICKET1 Sep 19651 Sep 19654 Feb 1966MA17 Nov 1976
8INTERCEPTOR7 Jun 19651 Sep 19654 Feb 1966MA16 Feb 1978
9INVESTIGATOR29 Mar 19651 Apr 196529 Mar 1965MA23 Dec 1970
10OUTPOST1 Jul 19651 Sep 19654 Feb 1966MA23 Nov 1970
11PROTECTOR28 Jul 19651 Sep 19654 Feb 1966MA29 Nov 2004/D
12VIGIL3 Mar 19651 Apr 196531 Mar 1965MA23 Nov 1970
13INTERDICTOR5 Aug 19651 Sep 19654 Feb 1966MA13 Jun 1974
14INTERPRETER1 Jul 19651 Jul 196526 Jul 1965MA3 Oct 1974
15INTERRUPTER/TRACER1 Jul 19651 Sep 19654 Feb 1966MA15 Jul 1974
16WATCHMAN1 Sep 19651 Sep 19654 Feb 1966MA3 Oct 1974

Class Notes:
Approved characteristics for Miscellaneous Auxiliary, Ocean Radar Station Ship (YAG), SCB Project No. 126, were promulgated on 3 June 1954 and updated for an Ocean Radar Station Ship (YAGR) on 20 January 1955 and on 8 January 1957. (The project number was shown only in the 1957 document.) Four former Liberty ships were acquired in June 1954. They were reclassified from YAG 41-44 to YAGR 1-4 (ocean radar station ships) in August 1954. By November 1954 four more such conversions were included in the FY 1955 budget for commissioning before July 1956 and a total of 16 such conversions was contemplated. As of January 1955 the planned conversion completion dates of the first four were 1 Feb, 15 Mar, 1 Apr, and 15 Apr 1955. They were to operate out of Newport, R.I., and take station in the "barrier" forces that extended to seaward the defensive radar coverage (DEW line) of the U.S. While on station they were controlled by Commander Naval Forces, Continental Air Defense Command, and when not on station they were under the administrative control of the Commander, Eastern Sea Frontier (soon changed to the Commandant, First Naval District). Similar arrangements were soon established on the West Coast based at San Francisco, and eventually the AGRs covered picket stations 400–500 mi off each coast. The ships had Combat Information Centers and facilities to control U.S. fighter interceptors against enemy targets. Their designed complement was 11 officers and 110 enlisted and each was commanded by a Lieutenant Commander (initially a Lieutenant). In view of their size (4243 tons light) CNO recommended that names be assigned. The names and YAGR designations (1-4) of the first four were approved effective 19 Jan 1955. The names and YAGR designations (5-8) of the second batch were approved effective 12 September 1955. Title to first eight was transferred from MA to USN 15 Feb 1966 (permanent transfer). On 9 April 1956 the Navy asked MA for permanent transfer of four more Z5-type Liberty ships to the Navy as YAGR 9-12, and MA approved the transfer from the Mobile reserve fleet on 20 April 1956. The classifications and names for YAGR 9-12 were approved on 7 August 1956, those for YAGR 13-15 (INTERDICTOR, INTERPRETER, and INTERRUPTER) followed on 19 Dec 1957, and those for YAGR 16 on 14 Apriil 1958. YAGR 1 was converted by NSY Norfolk, and of YAGR 2-4 one was converted at Norfolk and two at NSY Charleston, S.C.

On 29 May 1958 Commander YAGR Division 21 (the eight ship unit in the Atlantic) asked CNO to change the designator YAGR to AGR because the prefix "Y", meaning service craft, "had a subtle but definite adverse effect on the morale, the manning, and the supply of the ships." He also wanted the type name "Ocean Radar Station Ship" to be chaned to "Picket." Effective 28 Sep 1958, SecNav changed "Ocean Radar Station Ship (YAGR)" to "Radar Picket Ship (AGR)" (moving them from service craft to auxiliary vessels in SECNAV Instruction 5030.1A) and reclassified YAGR 1-16 to AGR 1-16. On 4 May 1959 the commanding officer of INTERRUPTER (AGR 15) requested that his ship's name be changed because of frequent confusion with INTERPRETER (AGR 14) and sometimes also INTERDICTOR (AGR 13), INTERCEPTOR (AGR 8), and even INTREPID (CVA 11). On 4 August 1959 SECNAV approved changing the name to TRACER, one of 11 names suggested by the ship, effective 4 September 1959. On 5 April 1961 the Commanding Officer of INTERDICTOR (AGR 13) requested a name change for his ship because of confusion with INTERPRETER and INTERCEPTOR but the matter was not pursued.

The basic radar suit of these ships eventually included two air search radars, originally an AN/SPS-12 (an upgraded SPS-6) with a parabolic horn-fed antenna plus after it became available in July 1957 an AN/SPS-17 with a bedspring antenna. The ships also had one AN/SPS-8 height finder radar and one AN-SPS-10 surface search radar. The two air search radars were on the two kingpost pairs between the forward hatches and aft of the deckhouse, although their positions on these varied between ships and over time. The height finder was always on a lattice platform between the after hatches and the small surface search radar was on a mast near the bridge. The original radars in the ships could only detect air targets to 50,000 feet altitude and a program was established to install improved radars with the required 60,000 feet coverage by 1 July 1958. The SPS-8 height finder was upgraded by replacing the original orange-peel shaped antenna with a nearly circular antenna, and the SPS-17 was upgraded to a longer range (300nm) SPS-17A which featured a huge horizontal 42ft wide antenna. Twenty SPS-17A systems were ordered in 1956, all for YAGRs, but no more were contemplated in view of development of the SPS-29, which also replaced the basic SPS-17 and the similar SPS-28. The 42ft antenna reappeared later in the SPS-37A and the SPS-43A.

Operations by the "barrier" forces in the Atlantic and the Pacific Oceans were discontinued by September 1965.

Ship Notes:
AGRNameMANotes
1GUARDIAN3137FY 1955. (ex-YAGR 1, ex-YAG 41) (ex-JAMES G SQUIRES, compl. 31 May 1945). Renamed 19 Jan 1955 as YAGR. [Decom from Musgrove.] To MA custody 28 Jul 1965. To buyer 21 Dec 1970.
2LOOKOUT3139FY 1955. (ex-YAGR 2, ex-YAG 42) (ex-CLAUDE KITCHIN, compl. 25 Jun 1945). Renamed 19 Jan 1955 as YAGR. To MA custody 12 Jul 1965. To buyer 17 Feb 1971.
3SKYWATCHER2337FY 1955. (ex-YAGR 3, ex-YAG 43) (ex-RAFAEL R RIVERA, compl. 30 Jan 1945). Renamed 19 Jan 1955 as YAGR. To buyer 17 Apr 1971.
4SEARCHER2338FY 1955. (ex-YAGR 4, ex-YAG 44) (ex-JAMES W WHEELER, compl. 5 Feb 1945). Renamed 19 Jan 1955 as YAGR. To buyer 31 Aug 1970.
5SCANNER2344FY 1956. (ex-YAGR 5) (ex-EDWIN D HOWARD, compl. 14 Mar 1945). Renamed 12 Sep 1955 as YAGR. To MA custody 26 Jul 1965. To buyer 4 Nov 1974.
6LOCATOR2347FY 1956. (ex-YAGR 6) (ex-FRANK O PETERSON, compl. 6 Apr 1945). Renamed 12 Sep 1955 as YAGR. To MA custody 27 Jul 1965. To buyer 4 Jan 1975.
7PICKET3138FY 1956. (ex-YAGR 7) (ex-JAMES F HARRELL, compl. 11 Jun 1945). Renamed 12 Sep 1955 as YAGR. [Decom from Musgrove.] MA custody 4 Aug 1965. To buyer 10 Dec 1976.
8INTERCEPTOR3147FY 1956. (ex-YAGR 8) (ex-EDWARD W BURTON, compl. 8 Nov 1945). Renamed 12 Sep 1955 as YAGR. To MA custody 1 Jul 1965.
9INVESTIGATOR2336FY 1957. (ex-YAGR 9) (ex-CHARLES A DRAPER, compl. 24 Jan 1945). Renamed 7 Aug 1956 as YAGR. To buyer 17 Apr 1971.
10OUTPOST3140FY 1957. (ex-YAGR 10) (ex-FRANCIS J O'GARA, compl. 30 Jun 1945). Renamed 7 Aug 1956 as YAGR. To MA custody 21 Jul 1965. To buyer 13 Apr 1971.
11PROTECTOR2346FY 1957. (ex-YAGR 11) (ex-WARREN P MARKS, compl. 29 Mar 1945). Renamed 7 Aug 1956 as YAGR. To MA custody 29 Jul 1965. To JRRF from HRRF 18 Sep 1970. BU complete 30 Nov 2005.
12VIGIL2339FY 1957. (ex-YAGR 12) (ex-RAYMOND VAN BROGAN, compl. 10 Feb 1945). Renamed 7 Aug 1956 as YAGR. To buyer 21 Dec 1970.
13INTERDICTOR3142FY 1958. (ex-YAGR 13) (ex-EDWIN H DUFF, compl. 27 Jul 1945). Renamed 19 Dec 1957 as YAGR. To MA custody 5 Aug 1965. To buyer 1 Jul 1974.
14INTERPRETER2341FY 1958. (ex-YAGR 14) (ex-DUDLEY H THOMAS, compl. 21 Feb 1945). Renamed 19 Dec 1957 as YAGR. [Decom from Musgrove.] To buyer 4 Nov 1974.
15INTERRUPTER/TRACER2340FY 1958. (ex-YAGR 15) (ex-WILLIAM J RIDDLE, compl. 15 Feb 1945). Renamed 19 Dec 1957 as YAGR. Renamed TRACER 4 Sep 1959. To MA custody 16 Aug 1965. Sold for conversion to a fish processing plant (Union Seafoods). To buyer 1 Aug 1974 and renamed UNION. BU 2000 in China.
16WATCHMAN2343FY 1958. (ex-YAGR 16) (ex-VERNON S HOOD, compl. 7 Mar 1945). Renamed 14 Apr 1958 1957 as YAGR. To MA custody 11 Aug 1965. To buyer 28 Feb 1975.

Page Notes:
Compiled: 19 Oct 2021
© Stephen S. Roberts, 2021
Sources: DB, Maroon, VSC