Level 7

Total Experience Required 7,715

Level 100 progress: 0.11%

This is roughly the same as:

Killing 13 people in Warzone, or...
Killing 14 people in Execution, or...
Killing 11 people in Wingman, or...
Scoring 2,756 points in Guardian, or...
Scoring 8,386 points in Annex, or...
Scoring 5,076 points in Submission.

Horde (TU4)

Completing 20 waves on Casual, or...
Completing 13 waves on Normal, or...
Completing 10 waves on Hardcore, or...
Completing 8 waves on Insane.

Or a combination of the above. Have fun!