MIL-W-81560, MILITARY SPECIFICATION, WEAPON, BIOLOGICAL AND CHEMICAL. GENERAL DESIGN SPECIFICATION FOR (12 SEP 1967)., This specification establishes general design requirements forall U. S. Navy biological and chemical weapons and prescribes uniformmethods for qualification and evaluation testing to assure soundness ofdesign, ability to withstand environmental extremes, adequate shelflife and safety in handling, transportation and storage. This specification.is intended for use by weapon design and developing activities. Itcovers the philosophy of design and the general design objectives forbiological and chemical weapons.