SC 482601 Fort Huachuca, Ariz. Daylight view of the Army's new compact all-weather radar "eye" (AN/PPS-4 Radar Set) which can spot a single enemy moving a half-mile away in darkness or fog, vehicles or large groups much farther away. The Army Signal Corps' electronic sentry was developed by Sperry Gyroscope Co., Great Neck, N.Y. to convert pinpoint radar signals for easy detection in the observer's headphone. Highly mobile unit shown here in operation by Pvt Anthony Devlin (Woodside, N. Y.) tracks "enemy" movements on plotting board as latest protection in forward combat zones. 1956.
Source: H. W. Andrews from Zahl papers.
U.S. Army
<a rel="nofollow" class="external text" href="https://www.army.mil/e2/-images/2009/11/05/55171/army.mil-55171-2009-11-05-091121.jpg">United States Army Official Web-site</a>