Level 49

Total Experience Required 583,954

Level 100 progress: 8.56%

This is roughly the same as:

Killing 974 people in Warzone, or...
Killing 994 people in Execution, or...
Killing 825 people in Wingman, or...
Scoring 208,555 points in Guardian, or...
Scoring 634,733 points in Annex, or...
Scoring 384,181 points in Submission.

Horde (TU4)

Completing 1,460 waves on Casual, or...
Completing 974 waves on Normal, or...
Completing 730 waves on Hardcore, or...
Completing 584 waves on Insane.

Or a combination of the above. Have fun!