Delivered to the US Army as 69-18005 and used for surveillance in Vietnam from 1970 to 1972. Registered as N64495 in 1973 and later N33YQ. Cancelled from the register in 2013. Preserved at the Museum of Flight, Boeing Field, Seattle, WA.

Lockheed developed the "Quiet Star" ultra quiet observation aircraft for the US Army to track night troop and supply movements in Vietnam. 69-18005 was deployed there from 1970-72. Sold to the Special School District of St Louis County, Missouri in 1973, it was acquired by Harold and Vic Hanson of Seattle and rebuilt to flying status, registered N33YQ as a Lockheed-Hansen YO-3A with the FAA. The fairly unique aircraft was sold again in 1987, fully restored and donated to the Museum of Flight in 2014.