Guardroom
/ˈɡɑːrdruːm,ˈɡɑːrdrʊm/
Definition 1 of 1
Pro Tip 1/3Military Setting
Used mainly in military contexts, referring to a secure place where soldiers are stationed. 
He was reprimanded for returning late to the guardroom.
Pro Tip 2/3Duty Assignment
Represents a specific task for soldiers, often involving security or disciplinary actions. 
She had guardroom duty last night and couldn't attend the dinner.
Pro Tip 3/3Access Restricted
A place with limited access, generally only authorized personnel are allowed entry. 
Non-military personnel aren't permitted in the guardroom without clearance.