MCWP 3-40.84-8The senior commander issues an establishing directive to guaran-tee both the supported and supporting commanders understandthe authority given to the supported commander. The establishingdirective specifies the purpose of the support relationship in termsof the desired effect and the scope of the action to be taken. It alsoshould include the following:zForces and resources allocated to the supporting effort.zTime, place, level, and duration of the supporting effort.zRelative priority of the supporting effort.zAuthority, if any, of the supported force to modify the support-ing force in the event of an exceptional opportunity or anemergency.zDegree of authority granted to the supported commander overthe supporting effort.The supporting commander fills the needs of the supported forcewithin his capabilities, based on the priorities and requirements ofother assigned tasks. The supporting commander determines theforces, tactics, methods, procedures, and communications neces-sary to provide the support. The supporting commander isresponsible for the following:zAdvises and coordinates with the supported commander on theemployment and limitations of his support.zAssists in integrating support into the supported commander’seffort.zEnsures his entire command knows the supported commander’srequirements.