[ToughOmbres]

Very good points from all who have posted.

I doubt things would deteriorate to the point that the old 2.35 and 3.5 inch bazookas would make a comeback in US inventories for lots of reasons. Many Third World nations would doubtlessly use them however.
Even with ramped up production (say, doubled from peacetime) I believe there would definitely be shortages before the Thanksgiving Day Exchange.
The Recoiless rifles would have some utility (Ranger Regiment kept them into the 90's IIRC?) and have a new lease on life-if ordnance could still be safely used.
Would any referee allow the cancelled VIPER anti-tank inventories to still be around, waiting to be used?
Nations that licensed anti-tank weapons such as Norway with the M-72 LAW would produce as much as they could, but comparatively small amounts I expect.
Does anyone see US forces in a pinch trading for or "acquiring" rifle grenades which France is so fond of?