Level 27

Total Experience Required 100,218

Level 100 progress: 1.47%

This is roughly the same as:

Killing 168 people in Warzone, or...
Killing 171 people in Execution, or...
Killing 142 people in Wingman, or...
Scoring 35,793 points in Guardian, or...
Scoring 108,933 points in Annex, or...
Scoring 65,933 points in Submission.

Horde (TU4)

Completing 251 waves on Casual, or...
Completing 168 waves on Normal, or...
Completing 126 waves on Hardcore, or...
Completing 101 waves on Insane.

Or a combination of the above. Have fun!