So there hasn´t apparently been an outcry against introducing goblins to represent the majority of the Vietnamese population in the 2nd elevator pitch. This means we can discuss another topic: The tone of the setting. Here are two suggestions but honestly there could be more or anything in-between:

1. Grim, gritty and/or brutal. 
This means the session would lean more heavily into a simulation and for lack of a better term the DM would try to create a more "realistic" environment. Players would need to be more cautious when making decisions in dangerous situations as things can and will go south pretty fast, if a gung-ho approach has been chosen. Characters need to be no nonsense career soldiers or go home early in a body bag.

2. Cinematic, cheesy and/or silly
Players have more leeway when being in tight spots and here and there is also room for comedic moments. The player character themselves do not need to be as serious as in the above version. A valid example could be the following: A cast akin to the Charlie´s Angels (2000 version with Cameron Diaz) make up the player characters. They are all in a punk band, obviously with big 80s hair, entertaining the troops in Vietnam and boosting morale with their gigs. They constantly move from base to base via chopper to play for the soldiers. Although they can´t always evade danger and when things get tough they themselves can lay down the law as they are also loaded up to the gills with cyberware just like their more serious counterparts.