The 101st Troop Command (101st TC) is a troop command of the Puerto Rico Army National Guard. The command provides command and control headquarters, and logistical and administrative support to other units of the Puerto Rico Army National Guard that are not structured under another formation headquarters. It also provides administrative support to units from other formations within Puerto Rico that are stationed a long way from their respective higher headquarters. Because of this, the command's units, formation, and structure tends to be inconsistent as it changes periodically from time to time as the National Guard or the United States Army needs.