Level 39

Total Experience Required 279,641

Level 100 progress: 4.1%

This is roughly the same as:

Killing 467 people in Warzone, or...
Killing 476 people in Execution, or...
Killing 395 people in Wingman, or...
Scoring 99,872 points in Guardian, or...
Scoring 303,958 points in Annex, or...
Scoring 183,975 points in Submission.

Horde (TU4)

Completing 700 waves on Casual, or...
Completing 467 waves on Normal, or...
Completing 350 waves on Hardcore, or...
Completing 280 waves on Insane.

Or a combination of the above. Have fun!