12th General Order of a Sentry
The 11 general orders refers to the Marine Corps guidlines for keeping watch during fire watch. Now only the Marine Corp has 11 however the Marines made one adition the 12th general order which is "To walk my post from flank to flank and take no shit from any rank"
so if a corporal is on guard and is instructed to let no one in for any reason and an officer demands entrance this is where the 12th General order of a Sentry comes into play, the corporal must tell the officer to leave and use force if neccessary, although under normal circumstances such an act would get the corporal demoted