Which event in the CFT primarily measures upper body strength?

The event that primarily measures upper body strength in the Combat Fitness Test (CFT) is the Ammunition Can Lift. This exercise specifically targets the muscle groups in the upper body, including the arms, shoulders, and back, as it requires participants to lift and carry a weighted ammunition can. The goal is to assess how well a Marine can perform tasks that are critical in combat situations, such as lifting equipment or other Marines in a rescue scenario.

In contrast, the Movement to Contact focuses on overall agility and tactical movement, the 880-meter run is primarily a cardiovascular test that evaluates endurance, and the Foot March assesses stamina and load-carrying capability rather than strict upper body strength. Thus, the Ammunition Can Lift is the most appropriate choice for measuring upper body strength within the context of the CFT.