Which of the following characteristics best describes the M2 .50 caliber machine gun?

The M2 .50 caliber machine gun is best described as belt fed and air cooled because these characteristics are fundamental to its design and operational capability. Being belt fed allows for sustained fire without the need for frequent reloading, enabling the weapon to deliver a high volume of fire in combat situations. This feature is particularly important given the .50 caliber cartridge's effectiveness against vehicles and personnel.

The air-cooled characteristic contributes to its functionality, allowing it to dissipate heat efficiently during extended firing sessions. Unlike water-cooled systems, the air-cooled design simplifies logistics and handling in the field. Overall, the belt-fed mechanism coupled with the air-cooled system enhances the M2’s reliability and versatility on the battlefield, making it a prominent choice for various military applications.