I'm not in that industry but if it's anything like other fields, I'd say this jargon has specific meaning to them.

If it's anything like it was ROTC, the jargon here is mainly to signal conformity.

The technical language serves to divorce the purchaser and the manufacturer from any moral responsibility by disguising what it's for. Nobody would buy a remote-controlled bomb for soldiers to blow each other up with, but a "man-portable delivery system" sounds much better.

The more technical the language the more dangerous the weapon.

It's the kind of language that makes colonels' and generals' ears prick up.

Just like how the marketing verbiage for enterprise software ("scalable", "five nines", etc.) is meant to impress decision makers in the private sector.

People always come up with ways to judge the reputation/in-group-membership/status of someone they're meeting for the first time. We can do it with clothes or accents or special jargon or StackOverflow badges, but somehow or other we always do it.

Defense guys love that kind of language.