One thing I meant to add: this extensive testing- and the enormous amount of documentation/training materials necessary to take an 18 year old with average ASVAB scores and produce someone who can cook meals for 200 other soldiers on four hours of sleep a night- is both why military things cost so much, relative to commercial grade stuff, and why they don't get updated particularly often. Frequent software updates that change menus around play havoc with the detailed training powerpoints that the military relies on to produce those 18 year old tool operators.

Secret Squirrel projects (which I was near but never read into) can get away with lower reliability because they can count on the users to be much better trained and prepared, though again, from my brief encounters with these sorts, they will ignore anything they don't trust to be completely reliable. Reliability matters far more than cutting edge for like 99.9% of military gear.