Tips

ARMA
In MOUT, three people can use the cover of the same corner, if one stands, one crouches and the other is prone.
ACE
General

Advanced Combat Environment

Ace is a community built mod, which adds dramatically to the realism in ARMA and ARMA II. it was created by some of the people originally involved with the OFP WGL project, and builds on its reputation as being the best addon available for ARMA.

 

Here are the default special keys available in ACE

Sight Adjustment Shift V
Jump J
NV brightness up PGUP
NV brightness down PGDN
Grenade throw mode Shift H
deploy tripod rest Shift SPACE
Clear jam Shift R