Level 36

Total Experience Required 220,039

Level 100 progress: 3.22%

This is roughly the same as:

Killing 367 people in Warzone, or...
Killing 375 people in Execution, or...
Killing 311 people in Wingman, or...
Scoring 78,586 points in Guardian, or...
Scoring 239,173 points in Annex, or...
Scoring 144,763 points in Submission.

Horde (TU4)

Completing 551 waves on Casual, or...
Completing 367 waves on Normal, or...
Completing 276 waves on Hardcore, or...
Completing 221 waves on Insane.

Or a combination of the above. Have fun!