The dio will be set in the Philipine Islands, after the U.S. forces return. I plan on having a team of 4-5 U.S. Marines advancing through some heavily overgrown jungle ruins. The dio will be the exact moment that the marines realize that they are not alone, and there are enemies in the surrounding ruins. The figures I have range from wary advancing to firing stances. I also plan to have the ruins partly flooded. The rest of the street, and some of the ruins will be covered in deep, murky water. There will be the top of a Sherman tank sticking out of the water.
I'm not sure if there were Shermans in the Philipines before the Japanese invaded. The Sherman would have been abandoned, left from the first occupation of U.S. forces. Also, in the second occupation, would U.S. Marines be carrying Thompsons?
On a more practical note, I can't decide if I want the Sherman to be in a river, or a stagnant pond/swamp. I'm not sure if it makes sense that the Marines would be standing on dry ground, and then 20-30 feet away, there is flood water deep enough to cover a Sherman.
If you made it this far...thanks for reading. Now, I really need some help with determining whether this is a plausible diorama idea. History buffs, I need you!!

Matthew