Seven basic helicopter models current in production at Sikorsky Aircraft were assembled recently on the flight field for a "family" portrait. Clockwise, from left foreground, are: CH-54 (U.S. Army), HH-52A (Coast Guard), CH-3E (Navy), UH-34D (Military Assistance Program), CH-3E (Air Force), S-61N for commercial airlines, and CH-53A (Marine Corps).
Sikorsky Aircraft photo, 12/1966. From Vertiflite (AHS Newsletter) Dec 1966. Figure 11.