Which of the following is NOT a mission of a MLR?

The mission of a Marine Littoral Regiment (MLR) focuses on enhancing naval operations and supporting the broader objectives of the Marine Corps within a maritime environment. Among the options provided, peacekeeping operations are not typically a core mission of an MLR. While peacekeeping operations may involve various military branches and can sometimes include Marine forces, they fall outside the specialized roles of an MLR, which is more focused on surface operations, air and missile defense, and maritime domain awareness.

Surface warfare pertains to the engagement and control of surface threats, which is essential for securing areas of interest within maritime regions. Air and missile defense involves protecting naval assets from aerial threats, a critical component of modern marine operations. Maritime domain awareness is vital for understanding and acting upon developments in the maritime environment, enabling the MLR to operate effectively. Thus, peacekeeping operations, while significant in other contexts, do not align with the primary operational focus of an MLR.