Final answer:
The Army value best described by the phrase provided is loyalty, which emphasizes commitment to the U.S. Constitution, the military, one's unit, and fellow soldiers.
Step-by-step explanation:
The Army value described by the phrase "Bear true faith and allegiance to the US Constitution, the Army, your unit, and other Soldiers" is loyalty. Loyalty involves a commitment and fidelity to the nation, the military, and fellow service members. It's about standing together and supporting each other as well as the principles outlined in the U.S. Constitution.