Welcome to Bolt Action.
Like with any gaming, you may meet "rivet counters" to historical buffs depending on their need for accuracy and then general gamers.
Rules-wise, yes, play any army against any other.
Many people like to play a "what if" scenario or use the game as a bit of a historical simulator so it is always a good idea to see what are your various opponent's preference.
I have been tempted to paint my Germans in purple uniforms led by a leader named Zoltar just to see who loses their minds.
The game plays very well, tons of fun.
The starter boxes are always good.
The typical M4A2 Sherman was used (Looking at 7th Marines Sep-Oct-1944) as best I can tell historically.
Seeing a fair bit of "Engineer" Battalions/Company used with them, artillery and Amphibian tractor/transport... it appears tanks were not all that common or at least once a beachhead was well established.
This "Order of Battle
" is neat for listing the groups for each battle.
They would use a "duplex drive" or a "fording kit" to get to shore:
There is all kinds of room to go as deep or as little you want.
Anyone who plays will appreciate something
you have done to play the game.