Which organization represents unlicensed deck personnel?

The correct answer is that the International Longshoremen's Association (ILA) represents unlicensed deck personnel. This organization provides support, advocacy, and labor representation for workers in the maritime industry, focusing specifically on the rights and interests of unlicensed maritime crew members.

The other organizations mentioned serve different segments of the maritime workforce. The Seafarers International Union (SIU) primarily represents licensed and unlicensed sailors, whereas the Marine Engineers' Beneficial Association (MEBA) focuses on engine department workers, particularly licensed engineering officers. The Marine Merchant Patrol (MMP) typically represents members involved in navigation and deck-related positions but is more focused on licensed officers rather than unlicensed deck personnel. Each organization plays a distinct role in labor representation within the maritime industry, reflecting the varying needs and responsibilities of their membership.