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MIL-HDBK-304C, DEPARTMENT OF DEFENSE HANDBOOK PACKAGE CUSHIONING DESIGN (1 JUN 1997).This handbook is for guidance only. This handbook cannot be cited as a requirement. If it is, the contractor does not have to comply. The information in this handbook applies chiefly to conventional cushioning materials. These materials include polyurethane foam, foamed polystyrene, and foamed polyethylene.