FM 6-27 governs the law of land warfare and the conduct of disciplined military operations in armed conflict.
View FM 6-27 on armypubs.army.mil
It covers LOAC principles, hostilities, civilians, combatants, detainees, the wounded and sick, occupation, non-hostile relations, and war crimes. It requires compliance with applicable U.S., international, and host-nation laws and regulations, LOAC, and applicable rules of engagement.
Treaties often go by different terms, such as Conventions or Protocols, but regardless of how titled, all treaties in force are legally binding on States Parties as a matter of international law. (paragraph 1-96)
First, they must take feasible precautions to reduce the risk of harm to protected persons and objects. Second, they must refrain from attacks in which the expected harm to civilians and civilian objects would be excessive in relation to the concrete and direct military advantage expected to be gained (DOD Law of War Manual, 5.11, 5.12, and 5.14; consider AP I, art. 57(2)). (paragraph 1-2)
The protection of civilians is a responsibility shared among all belligerents. (paragraph 1-2)
Feasible precautions are those precautions that are practicable or practically possible, taking into account all circumstances ruling at the time, including humanitarian and military considerations (CCW Protocol III art. 1, para. 5). (paragraph 1-2)
Members of the armed forces of a State party to a conflict, other than military medical personnel and chaplains attached to the armed forces are entitled to POW status based on their membership in the armed forces. (paragraph 3-17)