Level 47

Total Experience Required 507,990

Level 100 progress: 7.44%

This is roughly the same as:

Killing 847 people in Warzone, or...
Killing 864 people in Execution, or...
Killing 718 people in Wingman, or...
Scoring 181,425 points in Guardian, or...
Scoring 552,164 points in Annex, or...
Scoring 334,204 points in Submission.

Horde (TU4)

Completing 1,270 waves on Casual, or...
Completing 847 waves on Normal, or...
Completing 635 waves on Hardcore, or...
Completing 508 waves on Insane.

Or a combination of the above. Have fun!