cant get Add Ons to appear in game

[Ghostmooner 1]

i got helicopters, arma 2: OA and the Hinds addon all from steam. but i can't see any of them ingame. it says noisecontrollers and ReArmed is installed, but i don't see its content, or any Hinds. can anyone help???

[DnA 5029]

Hi, have you tried running Steam in administration mode? Sometimes it needs that to properly install the DLCs.