Your path to the camos, step by step

Understand the difference between weapon progression and challenge requirements.

Military camos are tied to weapon level, and special camo requirements change by mode. The launch update corrected some of the requirement text, so go by the latest information.

Steps

Pick the weapon and the challenge, and confirm the earlier requirements are unlocked.
Check the requirement for the mode you are playing; Multiplayer and DMZ requirements can differ.
After the round, check that the counter went up before you repeat the same approach.

Hint

If the counter did not move, check the unlock conditions, the required kill type, and the update before you assume there is a bug.

Introductory guide