Sentence:  The forces to be supported include an Army of 14 divisions and 870000 men ; a Navy of 817 active ships and 619000 men ; a <WSD>Marine</WSD> Corps of 3 divisions and 3 air wings with 175000 men ; and an Air Force of 91 combat wings and 825000 men . 
Meaning of the word marked with <WSD> tags:  an amphibious division of the United States Navy