Level 43

Total Experience Required 380,207

Level 100 progress: 5.57%

This is roughly the same as:

Killing 634 people in Warzone, or...
Killing 647 people in Execution, or...
Killing 538 people in Wingman, or...
Scoring 135,789 points in Guardian, or...
Scoring 413,269 points in Annex, or...
Scoring 250,137 points in Submission.

Horde (TU4)

Completing 951 waves on Casual, or...
Completing 634 waves on Normal, or...
Completing 476 waves on Hardcore, or...
Completing 381 waves on Insane.

Or a combination of the above. Have fun!