NSA guide to Writing Efficient Fortran (1972)

The NSA cared a lot about FORTRAN. Did I just learn something about the nature of code breaking, given FORTRAN's affinities?

"Originally developed by IBM at their campus in south San Jose, California in the 1950s for scientific and engineering applications, Fortran came to dominate this area of programming early on and has been in continual use for over half a century in computationally intensive areas such as numerical weather prediction, finite element analysis, computational fluid dynamics, computational physics and computational chemistry."

https://en.wikipedia.org/wiki/Fortran