At the peak of the war, over 6,000 Army Security Agency (ASA) soldiers were assigned to every major U.S. Army unit operating in Vietnam. They were sworn to secrecy and, for the most part, never receiving any recognition for the magnificent job they did. That, however, changed over the last few years, allowing two ASA veteran authors, Lonnie Long and Gary Blackburn, to chart the years that ASA operated in Vietnam - occurring from 1961 to 1973. ASA is first ordered to Vietnam in 1961 by...