The action of a force that aids, protects, complements, or sustains another unit. A supporting unit remains under the command of its parent headquarters; however the supporting unit is authorized and required, within the context of the directive establishing the relationship, to respond directly to the supported unit's request for support. A support relationship is established by the assignment of a tactical mission to the supporting unit. It may be expressed as direct support (OS), general support (GS), reinforcing, general support reinforcing (GSR), or the broader term of support with an explanatory directive. (AFPM 3-8-1, PAM 3-071(S-2008))

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