Vietnam War. Reconstruction of Vietnam War period records indicates a total of 149 Engineer OCS classes were graduated at Fort Belvoir beginning with Class 7 / 66 (10 June 1966) and ending with Class 5 / 71 (18 December 1970). Some were divided into two or more platoons. 

By TEOCSA count there were 10,382 graduates in the 4.5 years of operation. About half of the graduates of the Vietnam era were commissioned engineer.