Level 82

Total Experience Required 3,602,645

Level 100 progress: 52.78%

This is roughly the same as:

Killing 6,005 people in Warzone, or...
Killing 6,127 people in Execution, or...
Killing 5,089 people in Wingman, or...
Scoring 1,286,659 points in Guardian, or...
Scoring 3,915,919 points in Annex, or...
Scoring 2,370,162 points in Submission.

Horde (TU4)

Completing 9,007 waves on Casual, or...
Completing 6,005 waves on Normal, or...
Completing 4,504 waves on Hardcore, or...
Completing 3,603 waves on Insane.

Or a combination of the above. Have fun!