Level 62

Total Experience Required 1,330,651

Level 100 progress: 19.49%

This is roughly the same as:

Killing 4,436 people in Warzone, or...
Killing 4,527 people in Execution, or...
Killing 3,759 people in Wingman, or...
Scoring 950,466 points in Guardian, or...
Scoring 2,892,720 points in Annex, or...
Scoring 1,750,857 points in Submission.

Horde (TU4)

Completing 6,654 waves on Casual, or...
Completing 4,436 waves on Normal, or...
Completing 3,327 waves on Hardcore, or...
Completing 2,662 waves on Insane.

Or a combination of the above. Have fun!