Level 6

Total Experience Required 6,105

Level 100 progress: 0.09%

This is roughly the same as:

Killing 11 people in Warzone, or...
Killing 11 people in Execution, or...
Killing 9 people in Wingman, or...
Scoring 2,181 points in Guardian, or...
Scoring 6,636 points in Annex, or...
Scoring 4,017 points in Submission.

Horde (TU4)

Completing 16 waves on Casual, or...
Completing 11 waves on Normal, or...
Completing 8 waves on Hardcore, or...
Completing 7 waves on Insane.

Or a combination of the above. Have fun!