Level 35

Total Experience Required 202,711 [confirmed]

Level 100 progress: 2.97%

This is roughly:
Killing 676 people in Warzone, or...
Killing 690 people in Execution, or...
Killing 573 people in Wingman, or...
Scoring 144,794 points in Guardian, or...
Scoring 440,677 points in Annex, or...
Scoring 266,725 points in Submission.

Horde (TU4)

Completing 1,014 waves on Casual, or...
Completing 676 waves on Normal, or...
Completing 507 waves on Hardcore, or...
Completing 406 waves on Insane.

Or a combination of the above. Have fun!