Combat hours do not work either. The vehicle usage is working but the weapon usage and shots fired are not. The weapon effectiveness work great though, it shows the weapon used and the number of kills. This is from my groups page after doing a server save and exit 2 days ago.

0 hrs of combat
147 operations conducted
4595 confirmed kills
348 critical injuries / deaths
13.2 kill / death ratio
0 shots fired

This is from my individual page.

74.9 hrs played
56 operations conducted
1973 confirmed kills
129 critical injuries / deaths
15.3 kill / death ratio
0 shots fired

Combat Experience

Vehicle Experience: 25.6 hrs
Mounted Weapon Kills: 401
Flight hours: 14.8 hrs
Combat Dives: 0
Dive Time: 0 mins
Para Jumps: 2
Medical Experience: 1100 mins