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.
US Army Vietnam ARV (parch on picture #6)
Armed Forces Language School (patch on picture #7) in Saigon