when you assemble a vehicle for example and in your equipment consist explosive charges when you press SPACE key it auto deploying a charge and blows your vehicle
the same thing with Camouflage cover/tent when you cover a vehicle by pressing SPACE key it opens a window of "modify/rearm" interface (so i need to close that window every time)
1 choose any vehicle Aircraft static deffence (any kind of unit with "modify/rearm")
2 Look striaght on that unit
3 Press SPACE for assembling
you will see that window with modify/rearm opens without your will or
if you have explosives in your bag SPACE key will deploy it
or when yo just want to cover your vehicle with camouflage SPACE key press opens "modify/rearm" window in the same time