HOLWG, DoD, Jan 1977, revised Jul 1977. Fourth of the series of DoD requirements that led to Ada. "Department of Defense Requirements for High Order Computer Programming Languages", SIGPLAN Notices 12(12):39-54 (Dec 1977). "Revised Ironman Requirements for High Order Computer Programming Languages", US Dept of Defense, Jul 1977. (See Strawman, Woodenman, Tinman, Steelman).