Which aircraft is included in the MFA - 1A1X2 specialty?

The MFA - 1A1X2 specialty refers to the career field within the U.S. Air Force that specializes in managing and executing air transportation operations. This specialty encompasses various aircraft, including the C-5 Galaxy, which is a large military transport aircraft known for its immense cargo capacity and versatility in strategic airlifting missions.

The C-5 is designed to transport oversized cargo, making it an integral component of air mobility operations. Its ability to load and unload cargo through its nose and a rear ramp facilitates the transport of large military equipment and supplies efficiently. In contrast, while the E-4B (a modified Boeing 747), MH-139A (a helicopter), and KC-135 (a refueling aircraft) serve significant roles in different capacities within the military air operations sphere, they do not fall under the MFA - 1A1X2 specialty focused specifically on large transport logistics.

Thus, the C-5 Galaxy is the suitable choice for this specialty, as it aligns directly with the logistical and air mobility requirements that the MFA training emphasizes.