Level 44

Total Experience Required 409,418

Level 100 progress: 6%

This is roughly the same as:

Killing 683 people in Warzone, or...
Killing 697 people in Execution, or...
Killing 579 people in Wingman, or...
Scoring 146,221 points in Guardian, or...
Scoring 445,020 points in Annex, or...
Scoring 269,354 points in Submission.

Horde (TU4)

Completing 1,024 waves on Casual, or...
Completing 683 waves on Normal, or...
Completing 512 waves on Hardcore, or...
Completing 410 waves on Insane.

Or a combination of the above. Have fun!