There are plenty of 120mm black soldier figures for Vietnam to the
present, so I suppose it'd be relatively easy to use a head from one of
those, and mate it with a WWII figure body.
Kind of off topic, but it relates to the hardships these men had
to endure simply to serve their country. I was at an IPMS show a few
years ago. Our show is held at the Spruce Goose Museum every year, and
the model tables are planted amongst all the planes, usually under the
tail of the Goose. The museum is open for business during the show, so
there's no shortage of people there just for the museum, who had no
idea about the show. I was leaving the vendor tables with a Panther G
kit under my arm, and this old guy exclaims "German!?? What do want one
of those for???" (Obviously not a model builder). Then he tells me
about being a grunt in Korea, and how upset he was to see a tank
platoon drive past on a road with tanks manned by black guys. He was
still clearly agitated by it. Everything about the guy, up to that
point was kind of ticking me off, but that story stitched it. I just
said "Hmm", scowled and walked away.