US colonel in the foreground is probably Philip Cole, the colonel to his right with the general staff corps branch insignia is probably Sidney Mashbir.
Just happened to look at this; the illustration is an 80-foot Elco PT, distinguished by the two twin .50-caliber mounts being staggered, presumably to allow them to fire to either side. The other common PT, the 78-foot Higgins, had the.50s side-by-side immediately abaft the bridge. The total armament was the same in both types. The original Mark 8 torpedoes were carried in tubes. These were replaced by aircraft-type Mark 13s, which as shown were in lightweight racks. The weight savings allowed the heavy gun armament, especially the 40mm Bofors, to be mounted.