Level 31

Total Experience Required 144,013

Level 100 progress: 2.11%

This is roughly the same as:

Killing 241 people in Warzone, or...
Killing 245 people in Execution, or...
Killing 204 people in Wingman, or...
Scoring 51,434 points in Guardian, or...
Scoring 156,536 points in Annex, or...
Scoring 94,746 points in Submission.

Horde (TU4)

Completing 361 waves on Casual, or...
Completing 241 waves on Normal, or...
Completing 181 waves on Hardcore, or...
Completing 145 waves on Insane.

Or a combination of the above. Have fun!