Wiktionary
n. (context military English) (''notably http://en.wikipedia.org/wiki/USMC'') Is any weapon system that requires a crew or more than one individual to function due to its high operational complexity.
Wikipedia
A crew-served (crew-serve or crew service) weapon is any weapon system that requires a crew of more than one individual, as opposed to an individual service weapon, to function at optimum efficiency due to its operational complexity, such as requiring one person to load while another fires. The weight and bulk of the system often also necessitates multiple personnel for transportation.
Crew-served weapons operated by infantry include high-precision/special application rifles, anti-materiel rifles, medium machine guns, heavy machine guns, automatic grenade launchers, mortars with calibers less than 120 mm (4.72 inches), anti-tank guns, anti-aircraft guns, recoilless rifles, shoulder-launched missile weapons, and static anti-tank and anti-aircraft missiles.
These weapons are chiefly used as infantry support weapons. Many of these weapon systems can also be mounted on wheeled or tracked vehicles.
Usage examples of "crew-served weapon".
A heavy crew-served weapon could only be fired from an entrance ramp, and watching those was relatively easy.
When he got a little closer he could see that it was Corporal Kim up top, loading the crew-served weapon.
Every crew-served weapon in Fort Freedom had been brought out to face the Slammers, and none of them had survived.
A Heliodoran crew-served weapon raked the southern perimeter from a position far enough to the west to have been shielded from the exploding starship.
Perennius had not wondered at or even given thanks for his protege's unexpected competence with the crew-served weapon.
The cannon was designed for use as either a crew-served weapon or from a powered armor mount.
The two men behind the crew-served weapon were staring straight ahead.
Then anybody looks like they might be setting up a crew-served weapon.