The Marine Engineers' Beneficial Association (MEBA) is the oldest maritime trade union in the United States still currently in existence, established in 1875. MEBA primarily represents licensed mariners, especially deck and engine officers working in the United States Merchant Marine aboard US-flagged vessels. It is a member union of the AFL–CIO. Members and their families benefit from MEBA's collective bargaining agreements through the union's Medical Plan, 401(k) Plan, Pension Trust, and Vacation Plan.