Two Marine Defense Battalions (3rd & 4th), two U.S. Army infantry Divisions (24th & 25th) less the 299th Battalion that was detached to the other Islands, four coastal artillery regiments, four AAA regiments (3", 40mm, 20mm, .50 cal), plus the Hawaiian NG units (as well as the rest of the military force on the islands, including the AAF ground elements, with rifles and the Honolulu cops). Call it 15,000 trained men fighting from prepared positions or in positional defenses that they were trained to defend, and an addtional 15-20K fighting from scratch positions (with roughly half of these having a reasonable chance of hitting something with their rifle).