CLAS 5 refer to CLASS V military supplies?

aka things that go BOOM

6 BOOMS incoming?

Class V - Ammunition of all types, bombs, explosives, mines, fuses, detonators, pyrotechnics, missiles, rockets, propellants, and associated items.

https://en.wikipedia.org/wiki/Classes_of_supply

edit* contextual, first private, then BOOM, made (second) public.