Bottomline is the US Army has a definition of the term, so it is very much a military term (albeit one mostly focused on threat weapons like the AK series, and out of an obscure pub from 1970).
What's interesting is to compare that to the NRA glossery definition which takes some editorial licence with the nuance of the term. Influence and inform perhaps?
I'm curious to know where this definition can be found. Even so, based on what you're describing, it seems the term is less related to the standard issue weapons in Army service (automatic or otherwise) and more related to Soviet bloc weapons. Certainly within the modern military culture and jargon, "assault weapon" is not a commonly used term.
Sturmgewehr also comes to mind as a miltary term, albeit not a US one, that typifies what drove weapons development following WWII that resulted in both the AK and AR series.
I'm not too sure how much qualifying the remarks about where we served inside the Marines helps, but since we're laying it out there I too grew up in combat arms units (proudly a repeat offender in 8th Marines at multiple Bns and the Regimental level) both in peacetime and combat. Much of the perspective I laid out last time derives directly from the IOC deep dive into Stormtroop tactics (WWI German assault techniques to clear trenches and punch through defenses). Semantics to be sure, but this is all semantics.
r-
Ray
I agree the term had some historical usage when describing WWI and WWII era automatics. In modern military discussions, the term simply isn't used.
My comments about my service were brought up merely to point out that you're not the only one here with a military perspective on this issue. It sounds like you and I were very much in the same grunt community in the USMC, though I'm not sure our service times coincided. Outside of discussing certain WWI and WWII era weapons, "assault weapon" is not a term that is used, either as doctrine or informal jargon, within the USMC or the DoD in general.
That's not what an “assault rifle” is. What you described is a machine gun.
Actually, I disagree. In service, an AR-15 derived weapon is referred to as an M4 or M16, depending on barrel and stock length. Informally they may also be referred to as rifles or carbines. Most of these weapons are capable of 3 round bursts, though some early variants had full auto. Even so, they are not considered true machine guns.
A true machinegun is usually belt-fed or drum-fed (some, like the M249 can take standard issue magazines as well). They have larger barrels, beefier internals and better cooling, all of which makes them much better suited to prolonged bursts of automatic fire. The M4's, M16's and other infantry rifles may be capable of automatic fire, but that ability is inherently limited, mostly due to overheating.
In the wake of the 1986 NFA regulation, any civilian firearm capable of firing in full auto has been informally referred to as a machinegun. But technically speaking, the M2 .50 cal's, M249's, M240's and similar platforms have higher rates of fire and are better suited for full auto versus the M16's and other infantry rifles that have automatic fire modes.