The M240B is a variant of the M240, used by the U.S.

The M240B is a variant of the M240, used by the U.S. Army, Navy, Coast Guard and Marines. It comes configured for ground combat with a buttstock and bipod, though it can also be mounted on tripod, ground vehicles, aircraft, aboard ships and small boats. It is almost always referred to as an M240 Bravo or even just 240 verbally. It has also referred to as “The Pig”.
The M240, officially the Machine Gun, 7.62 mm, M240, is the US military designation. The M240 has been used by the United States Armed Forces since the late 1970s. It is used extensively by infantry, most often in rifle companies, as well as on ground vehicles, watercraft and aircraft. Despite being heavier than some comparable weapons it is highly regarded for reliability and its standardization among NATO members is a major advantage.
All variants are fed from disintegrating belts and are capable of firing most types of 7.62 mm (.30 cal) NATO ammunition. M240 variants can be converted to use non-disintegrating belts. There are significant differences in weight and some features among some versions which restrict interchangeability of parts.