The 4th pattern Tropical Combat Coat was the first to be made from rip-stop cotton poplin. Like the 3rd model jungle jacket it had a back yoke and was produced in both OG-107 and ERDL camouflage. However, the new design had no hanger loop, only one pen pocket (located behind the left chest cargo pocket) and the pocket drain holes removed from the 3rd pattern jacket were reintroduced.
MACV (patch on picture #6) : U.S. Military Assistance Command, Vietnam was a joint-service command of the United States Department of Defense. MACV was created on 8 February 1962, in response to the increase in United States military assistance to South Vietnam. MACV was first implemented to assist the Military Assistant Advisory Group (MAAG) Vietnam, controlling every advisory and assistance effort in Vietnam, but was reorganized on 15 May 1964 and absorbed MAAG Vietnam to its command when combat unit deployment became too large for advisory group control. MACV was disestablished on 29 March 1973 and replaced by the Defense Attache Office, Saigon (DAO).
Armed Forces Language School (patch on picture #7) in Saigon