I have worked with some people in the defence industry who got just that from Adobe and a few similar vendors. They had to negotiate with adobe and sign NDAs both ways, and they payed through the nose for it. But you can do it.
"Be defence forces of (checks profile) one-of-the-five nation states" is not a standard of negotiation requirement I deem attainable for just about anyone that isn't one of the five or EU the union.
Fair enough, but how life-crucial can an old copy of Adobe be?... I'm assuming a project like the Voyager mission relies on something a bit more bespoke than a copy of Adobe Creative Whatever. I really hope the defence forces core mission doesn't depend on Adobe Creative Cloud.
I guess the main reason here isn't "keeping an old version", but having a version that doesn't require an internet connection to be activated and doesn't send any data to Adobe.
But having an older version can be useful too because some features from previous releases may be missing in current ones, so that's a way to ensure access to the old files. A couple of years ago all the Pantone colours used in Photoshop just became black after an update because Adobe stopped licensing Pantone stuff.
