Snoopy was a popular figure for Vietnam War patches. A military unit would create a patch as an insignia for their members. The patches can be crude, both in their manufactuering and their humor. The representation of Snoopy was always unlicensed and generally looks very amateurish. Military patches are popular with collectors for their connection with history and variety. The values have been increasing over the years with the increased interest in their history.
“The 20th Tactical Air Support Squadron was formed at Da Nang in November 1965 as part of the 505th Tactical Control Squadron. Flying old US Army, Bird Bog Aircraft used for aerial reconnaissance for ground troops, primarily Special Forces and the 20th TASS had outposts at various Special Operations, Forward Op’s Base camps, notably Khe Sanh, Dong Ha, Quang Tri, Hue and Kham Duc. This piece from their base at Pleiku and operations over the I Drang Valley.” from collectPeanuts.com