national defense calculations
In this text In 1953, IBM delivered its 701 Electronic Data Processing Machine, a large-scale computer for scientific and engineering applications, including national defense calculations. is the unusual phrase national defense calculations.
It would appear the project's internal IBM name, Defense Calculator, has become tangled with the machine's description. See Bash, ... IBM's Early Computers p.135-164. The tangle can be deleted without loss. The project's name (which is of historic interest - p.135) should be stated explicitly if desired.