Hey,
I have the same issue. It drives me crazy, especially during wastelands multiplayer (but it can also crash in main menu) :/

I attached crashdump.* (with dumps for 3 same-looking recent crashes I remember), and DxDiag_mark (as dxdiag output). I hope it will help you solve the issue :)

As I checked, the possible quick-fix is to go to ARMA3 directory and in properties change compatibility mode to Windows XP Service Pack 3 and check 'Run as Administrator' :)