The BorderPatrol was originally founded on May 28, 1924 as an agency of the United States Department of Labor.
The priority mission of the Patrol, as a result of the 9/11 attacks and its merging into DHS, is to prevent terrorists and terrorist weapons from entering the United States of America.
However, the BorderPatrol's traditional mission remains as the deterrence, detection and apprehension of illegal immigrants and individuals involved in the illegal drug trade who generally enter the United States other than through designated ports of entry.
The BorderPatrol (USBP or BP), as the mobile uniformed branch of the Immigration and Naturalization Service (INS), has as its mission the detection and prevention of smuggling and illegal entry of aliens into the United States, with primary responsibility between the Ports-of-Entry.
Patrol Agents perform their duties along, and in the vicinity of, the 8,000 miles of United States boundaries.
To help it execute the missions it is tasked with performing, the USBorderPatrol maintains several tactical units, located at various locations throughout the US.