Level 96

Total Experience Required 6,041,216

Level 100 progress: 88.51%

This is roughly the same as:

Killing 10,069 people in Warzone, or...
Killing 10,275 people in Execution, or...
Killing 8,533 people in Wingman, or...
Scoring 2,157,578 points in Guardian, or...
Scoring 6,566,540 points in Annex, or...
Scoring 3,974,485 points in Submission.

Horde (TU4)

Completing 15,104 waves on Casual, or...
Completing 10,069 waves on Normal, or...
Completing 7,552 waves on Hardcore, or...
Completing 6,042 waves on Insane.

Or a combination of the above. Have fun!