So, thermonuclear bombs are ok, then (not on the list!)??
Colonel Bubbies, an old fashioned Army Surplus Store, in Galveston, used to have a display with a half a dozen types of inert grenades for sale. And a hand written sign taped to it “Col. Bubbies recommends that customers planning to fly home not purchase these.”
Back in April, 1971, I took advantage of a new leave program. This was separate from the standard R&R and was a 14-day leave to the land of the Big PX. You left on a commercial charter from the civilian side of Than Son Nhut airport, not a military aircraft or military charter.
My scheduled departure was delayed by an operation on the Laotian border, so the Squadron Commander sent an aircraft to pick me up and fly me directly to Than Son Nhut. When we got there, I turned my CAR-15 and .45 over to the crew and hopped off with my rucksack. I was half way to the ops building when I remembered what was in my ruck - ammo, mini-frags, mini-smokes, C-4, two claymores, signal flares. I went back to the bird and unloaded all of that stuff. No one ever checked from that point until we landed in Dallas. Customs could have checked, but since I hadn’t bathed in over 14 days, I don’t think they were inclined to do so.