Historic California Posts, Camp, Stations and Airfields
Los Angeles Defense Area Site LA-57
Nike-Ajax missile on the magazine elevator. (LA-57L)
The former Los Angeles Defense Site LA-57 encompasses two separate locations. Total land acquisition in fee for Location A was 11.74 acres. The United States Army purchased 10.99 acres from the Redondo Improvement Company on 20 August 1956, and 0.75 acres from the California Water Service Company on 17 June 1958. Total nd acquisition for Location B was 186.37 acres through a land lease agreement with the City of Torrance, CA, commencing on 1 September 1955.

Location A was used as an Integrated Firing Control (IFC) Center known as LA-57C. Apparently four single story concrete masonry unit buildings with a total area of 2,653 square feet were constructed, along with necessary utilities.
Location B was used for missile launching (LA-57L) and administrative (LA-57A) purposes. 150.38 acres were used for line-of-sight clearance, 20.97 acres were used for safety areas, and 15.02 acres were used exclusively as a missile launch site. 3. The site was deactivated in March 1963. The 11.74 acres making up Location A were reported as excess to the General Services Administration on 8 May 1967 and conveyed to the City of Redondo Beach by quitclaim deed on 26 April 1971, with the condition that the property be used as a park or recreational area by the general public. Today this area is called Wilderness Park Recreation Center. A portion of the lease agreement (171.35 acres) at Location B was terminated on 31 August 1965, leaving only the launcher site under lease (15.02 acres).
That remaining 15.02 acres was used by the Sixth U.S. Army for Army Reserve purposes, with plans to construct a permanent US Army Reserve Center (USARC). This leased portion was reduced by 4.32 acres on 4 January 1970 leaving 10.7 acres for the USARC. In February, 1965 the selection of of the site as a permanent USARC was cancelled. No record of disposal or transfer of the 10.70 acres is available. By then all military operations had ceased on the properties associated with Los Angeles Defense Area Site LA-57 and today this area is owned and controlled by the City of Torrance.
Army and Army National Guard units that garrisoned the missile site were:
Source: Los Angeles District, US Army Corps of Engineers, History compiled in 1999.

The Western Electric SAM-A-7/M1/MIM-3 Nike Ajax

The Nike Ajax was the world's first operational surface-to-air guided missile system. Its origins lay in the immediate post-war time, when the U.S. Army realized that guided missiles were the only way to provide air-defense against future fast high-flying bombers. Western Electric became the prime contractor for the XSAM-G-7 Nike missile system and Douglas as the primary subcontractor was responsible for the missile airframe.

The first unguided Nike missiles were fired in 1946, but problems with the original multi-rocket booster (eight solid-fuel rockets wrapped around the missile tail) soon led to delays in the program. In 1948, it was decided to replace this booster pack with a single rocket booster, attached to the back of the missile. The main propulsion of the missile was a Bell liquid-fueled rocket motor, and the flight path was controlled by the four small fins around the nose. In November 1951, the first successful interception of a QB-17 target drone succeeded. The first production Nike (which had been redesignated SAM-A-7 in 1951) flew in 1952, and the first operational Nike site was activated in 1954. By this time, the missile had been designated by the Army as Guided Missile, Anti-Aircraft M1. The name had changed to Nike I, to distinguish it from the Nike-B (later MIM-14 Nike Hercules) and Nike II (later LIM-49 Nike Zeus). On 15 November 1956, the name was finally changed to Nike Ajax.

The Nike Ajax missile used a command guidance system. An acquisition radar called LOPAR (Low-Power Acquisition Radar) picked up potential targets at long range, and the information on hostile targets was then transferred to the Target Tracking Radar (TTR). An adjacent Missile Tracking Radar (MTR) tracked the flight path of the Nike Ajax missile. Using tracking data of the TTR and MTR, a computer calculated the interception trajectory, and sent appropriate course correction commands to the missile. The three high-explosive fragmentation warheads of the missile (in nose, center, and aft section) were detonated by ground command, when the paths of target and missile met.

One of the major disadvantages of the Nike Ajax system was that the guidance system could handle only one target at a time. Additionally, there was originally no data link between different Nike Ajax sites, which could lead to several sites engaging the same target. The latter problem was eventually solved by the introduction of the Martin AN/FSG-1 Missile Master command-and-control system, with automatic data communication and processing. Other problematic features of the Nike Ajax system were the liquid-fuel rocket motor with its highly toxic propellants, and the large size of a complete site with all components, which made Nike Ajax to all intents and purposes a fixed-site air defense system.

By 1958, nearly 200 Nike Ajax sites had been activated in the United States. However, the far more advanced MIM-14 Nike Hercules soon replaced the Nike Ajax, and by late 1963, the last Nike Ajax on U.S. soil had been retired. In 1963, the Nike Ajax had received the new designation MIM-3A. Despite the use of an MIM (Mobile Intercept Missile) designator, the mobility of the Nike Ajax system was more theoretical than actually feasible in a combat situation.

The MIM-3A continued to serve with U.S. overseas and friendly forces for many more years. In total, more than 16,000 missiles were built.


Source: Directory of U.S. Missiles and Rockets, http://www.designation-systems.net/

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Updated 8 February 2016