Soldats de ma Vieille Garde

(Badge may require to rejoin, or to press P multiple times)
In order to get this badge, you must complete the following tasks:

1. Get a KDR of 10 or above.
2. Save 51 teammates from being grabbed by a zombie.
3. Stay alive for 35 rounds, without restarting, on Endless. It can start at any wave, just as long as you stay alive for 35 rounds in total.
4. Win 30 times or above in the campaign mode.
5. Acquire the following badges: Old Yeller, Cold Front, Explosive Retreat, and Deliverance from the Catacombs.

This unlocks the Old Guard Regiment under France.