In the military, a Tour of Duty is a period of time spent at sea or assigned to service in a foreign country.
Example Usage of Tour
frezit: completely? noooo :( RT @djknucklehead: Just found out that our UK Tour in MARCH is completely SOLD OUT! Holy crap
jennnniferwhite: RT @XChadballX: Hey everyone who keeps tweeting about our 10 yr Tour with Saves the day. Ticket Presale on the 14th. onsale on the 18th ...