Hiya Mikey , don't go quoting me on this but the begining of the Pacific campaign - Marines hit the beach and took the island - the Army came ashore and secured said island so the Marines could go get another piece of real estate .
I do believe the island hopping war was solely led by the Marines , McAurther had the army for the Philippene campaign .
The U.S. Army landed on Guadalcanal in Dec. 1942 and fought the remnants of the Japanese , I believe it was the Americal divisions , the ist Marine division withdrew for r&r .
The Okinawa campaign was an Army - Marine affair .
Burma southwest asia - Army .
Lottsa gaps , but in a nutshell that's about it .
Other than the two pics you've got Mike [ which I think are the only two 105mm/lvt pics. ] here's some allied field work for lvts , 37mm , 20mm , 40mm , flamethrowers and even a 25lb'er .