Task: Question Answering
Input (English): Passage: Jim Street, a former U.S. Navy SEAL and hot-shot cop from the Los Angeles Police Department and his SWAT team are sent to stop a gang of robbers who have taken over a bank. His high-tempered partner and close friend Brian Gamble disobeys an order to hold their position and engages the bank robbers, accidentally wounding a hostage in the process. Gamble and Street are demoted by Captain Fuller, the commander of the LAPD Metropolitan Division. Gamble quits the force following an intense argument with Fuller, and Street is taken off the team and sent to work in the "gun cage", where he looks after the gear and weaponry. Fuller offers Street the chance to return to SWAT by selling Gamble out, but he refuses, though people refuse to trust him as his decision was never made public. 
Six months after the incident, the chief of police calls on Sergeant Daniel "Hondo" Harrelson, a former Marine Force Recon Sergeant  who fought in Vietnam, to help re-organize the SWAT platoon. Hondo puts together a diverse team, including himself, Street, Christina Sánchez, Deacon Kaye, TJ McCabe, and Michael Boxer. The team members train together, eventually forging bonds of friendship. As a result, their first mission to subdue an unstable gunman is a success. 
Question: What branch of the military did the person who worked in the "gun cage" belong to?
Output (English): U.S. Navy.