[Sean C]

1. GI JOE mold in origins. It's Tunnel Rat's pack, but his had holes on the flat end for flash lights. And it wasn't that bright of a green. Not sure if it's a bootleg or Hasbro reused it somewhere else.
(Edit: It's from the Stargate movie Dr. Daniel Jackson.)
5 is Klingon Disruptor from Playmates Star Trek Gowron
12. Remco American Defense or US Forces
13. GI JOE Cobra GUILLOTINE from the Steel Brigade vs Plague 6 figure set. (2006)