In my experience in the aerospace industry working closely with USAF, it depends entirely on the program (as in military/civil program, not computer program) as

In my experience in the aerospace industry working closely with USAF, it depends entirely on the program (as in military/civil program, not computer program) as well as the systems being targeted for deployment. I worked on projects that allowed Python 2, but not 3, some that only allow the Python that ships with Anaconda or Canopy. Many programs and classified environments are barely getting approval for C++11 and some unfortunate teams are stuck with uncompiled VBA macros behind Excel UIs because the security personnel for their target systems is unable to review compiled code in fewer than 6 months... it is a mess.