MIL-STD-2040, DEPARTMENT OF DEFENSE STANDARD PRACTICE: TUG REQUIREMENTS FOR HANDLING U.S. NAVY SHIPS (3 MAR 1992)., The purpose of this document is to establish technicalstandards for contracting commercial tugs in order to perform tug services inresponse to the operational needs of U.S. Navy ships. The main objective of this document is to establishacceptable commercial tug performance and outfitting requirements whilemaintaining maximum flexibility in order to satisfy diverse shiphandling andharbor requirements without unduly restricting tug selection.