Level 70

Total Experience Required 2,057,255

Level 100 progress: 30.14%

This is roughly the same as:

Killing 3,429 people in Warzone, or...
Killing 3,499 people in Execution, or...
Killing 2,906 people in Wingman, or...
Scoring 734,734 points in Guardian, or...
Scoring 2,236,147 points in Annex, or...
Scoring 1,353,458 points in Submission.

Horde (TU4)

Completing 5,144 waves on Casual, or...
Completing 3,429 waves on Normal, or...
Completing 2,572 waves on Hardcore, or...
Completing 2,058 waves on Insane.

Or a combination of the above. Have fun!