Level 19

Total Experience Required 44,497

Level 100 progress: 0.65%

This is roughly the same as:

Killing 149 people in Warzone, or...
Killing 152 people in Execution, or...
Killing 126 people in Wingman, or...
Scoring 31,784 points in Guardian, or...
Scoring 96,733 points in Annex, or...
Scoring 58,549 points in Submission.

Horde (TU4)

Completing 223 waves on Casual, or...
Completing 149 waves on Normal, or...
Completing 112 waves on Hardcore, or...
Completing 89 waves on Insane.

Or a combination of the above. Have fun!