The Unit Episode 4.13 The Spear of Destiny

Chilean Andes. Jonas and a wounded Mack take refuge in a monastery, where they are protected by benevolent monks. Afterwards, Jonas is conflicted when given an order to steal the monks' prized possession, the "Spear of Destiny" (the spear that pierced the side of Christ, and which is believed to hold the power to grant its possessor victory in any battle).

After being jacked up on heroin in Macau (Episode #412), Bob -- at home enduring self-detox-- gets assigned a mission in Kansas City. Kim is determined to stop him from using drugs, and goes on the mission as a "watchdog," setting up Kim to witness the darkest aspects of Bob's job.