The crimp around military primers should be removed before handloading. I've never heard of leaving a crimp in military cases and it's fairly easy to remove the crimp.
Some folks like to use a swage tool. This
RCBS primer pocket swage is one example.
Or, you can use something like this
chamfer tool from Forster
For myself, I've had good service from this little
Lee chamfer tool. If I were doing large quantities, I might use something different, but this little tool has been on my bench for two decades.
It's fairly easy to remove the crimp from military brass. Indeed, it's just another step in case preparation.