Which type of aircraft is primarily used by the United States Marine Corps as a utility helicopter?

The UH-1N, often referred to by its nickname "Huey," is primarily used by the United States Marine Corps as a utility helicopter due to its versatility and operational capabilities. This aircraft is designed to perform a variety of missions including troop transport, medevac, airborne command and control, and logistical support. Its twin-engine configuration allows for improved safety and performance, especially in challenging environments and during diverse mission profiles.

The UH-1N's design incorporates a robust airframe and advanced avionics, which enable it to operate effectively in varied conditions and terrains. Its spacious cabin can accommodate multiple troops or cargo, which enhances the Marine Corps' ability to respond to a wide range of operational needs. The versatility, reliability, and adaptability of the UH-1N make it an essential component of the Marine Corps' rotary-wing fleet.

In contrast, the other aircraft listed serve different roles. The T-34C is primarily a trainer aircraft, while the SH-60B/F is designed for anti-submarine warfare and maritime operations. The T-45A is primarily a trainer used for naval aviation training.