Trying to unlock a piece of the US Army outfit by beating every player at poker in Blackwater.

It goes a little something like this:

Marston goes all in.
Random Chinese guy goes all in.
Marston shows a pair of Kings. "Got this guys chips in the bag." /smug
Random Chinese guy shows a pair of Aces.

Marston slowly stands, removes gun from holster, and proceeds to fill said Chinaman with lead. Load and repeat ad infinitum.