Level 17

Total Experience Required 35,421

Level 100 progress: 0.52%

This is roughly the same as:

Killing 60 people in Warzone, or...
Killing 61 people in Execution, or...
Killing 51 people in Wingman, or...
Scoring 12,651 points in Guardian, or...
Scoring 38,502 points in Annex, or...
Scoring 23,304 points in Submission.

Horde (TU4)

Completing 89 waves on Casual, or...
Completing 60 waves on Normal, or...
Completing 45 waves on Hardcore, or...
Completing 36 waves on Insane.

Or a combination of the above. Have fun!