MIL-STD-40000, MILITARY STANDARD: PARTS CONTROL PROGRAM FOR NON-DEVELOPMENTAL ITEMS (NDIS) (30 APR 1991) [S/S BY MIL-HDBK-402]., The purpose of this standard is to specify the requirements for conducting an effective parts control program in the acquisition of an NDI system from time of contract award and continuing through the operational (fielding) phase of the system.