Level 26

Total Experience Required 91,218

Level 100 progress: 1.34%

This is roughly the same as:

Killing 153 people in Warzone, or...
Killing 156 people in Execution, or...
Killing 129 people in Wingman, or...
Scoring 32,578 points in Guardian, or...
Scoring 99,150 points in Annex, or...
Scoring 60,012 points in Submission.

Horde (TU4)

Completing 229 waves on Casual, or...
Completing 153 waves on Normal, or...
Completing 115 waves on Hardcore, or...
Completing 92 waves on Insane.

Or a combination of the above. Have fun!