Backpack Nukes.

[swaghauler]

The W33 (8" configurable yield) AND W48 (6" 0.12kt Nominal Yield) were BOTH removed from service starting in 1991.

The W33s had seen 20 YEARS of frontline service since their last overhaul and were at the end of their service life. They were very versatile nukes with the four Standard Packages having Nominal Yields of 5kt, 10kt, 5kt (neutron), and 40kt. Their weight ranges of 126kg to 180kg (depending on model and package installed) make them cumbersome, though.

The W48 had a Nominal Yield so low that generation 1 Thermobaric devices were just as destructive WITHOUT the fallout. This caused them to be removed from service as well. This would be the best candidate for a backpack bomb with a weight of just 58kg.

These shells were fairly rare before the war and would be extremely rare in Twilight2000.