Nice grouping. All post WW2.
I have included lots of pictures, so be sure to view and enlarge all pics for more detail.
Group of Vietnam Era US Army Patches and Pins - SEE PICS
Shoulder sleeve insignia - Wikipedia
Military Assistance Command, Vietnam – Studies and Observations Group - Wikipedia
The Angels in Red Hats: MACV Team 162
4th POG(A) Home
US Now Aiding Vietnam in Finding the Country's Missing in Action from Past Conflict Between the Two
Sold At Auction: US ARMY COLD WAR TO GULF WARS PATCHES LOT
Decorations of a Different Kind Gallary
The Buildup for Invasion, The National WWII Museum