Marines Serve at Sea PW Soldiers of the Navy U. S. MARINES! Marines are trained as infantrymen, artillerymen, engineers, airmen and signalmen. They are also trained in many of the duties of the sailor. Land-Sea-Sky The wide range of their usefulness has sent them first to the front in every war, or near-war, in which the United States has engaged. Marines and action are synonymous, and in military terms are almost interchangeable. Artillerymen Airmen Signalmen Engineers Action-Marines-Marines-Action U. S. Marine Recruiting Station 122 NORTH SEVENTH STREET, ST. LOUIS, MO.