U.S. Dep't of Defense, Instruction No. 5025.01, Part II (Oct. 28, 2007)
AI: A DoD issuance, no more than 50 pages in length, that provides general procedures for implementing policy for the administration of the DoD Components in the NCR that are serviced by WHS. AIs implement policy established in DoDDs or DoDIs. AIs shall be signed by the DA&M or the Director, WHS.