The man on the far left is believed to be PFC Sam Stenzel Company C of the 31st Infantry.
PFC Stenzel,
31st INF died in Camp O'Donnell on 5-26-42 of malaria and dysentery.
 

Next is Frank Spear,
31st INF (4th Chemical also) who died on 7-18-43,  in Fukuoko, Japan.

and third is Captain James Gallagher (looking up-haunting look in his eyes).
Gallagher was killed soon after that picture was taken. His DOD is 4-09-42.
 

                                  Credit: NARA and Abraham Home Page