Level 5

Total Experience Required 4,641

Level 100 progress: 0.07%

This is roughly the same as:

Killing 8 people in Warzone, or...
Killing 8 people in Execution, or...
Killing 7 people in Wingman, or...
Scoring 1,658 points in Guardian, or...
Scoring 5,045 points in Annex, or...
Scoring 3,054 points in Submission.

Horde (TU4)

Completing 12 waves on Casual, or...
Completing 8 waves on Normal, or...
Completing 6 waves on Hardcore, or...
Completing 5 waves on Insane.

Or a combination of the above. Have fun!