See also Rogue Trooper from 2000AD -

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

in which the 'biochips' where backups for the minds of disposable, genetically engineered soldier's bodies.

There's a fun sci-fi series by Richard K Morgan that uses this concept. It starts with "Altered Carbon."

Or Lawnmower-man, imagine a way to give anyone Jason Bourne like intelligence/abilities or a Matrix type interface to the brain.

Need to learn to fly an Apache? No problem just download Pilot 1.0.