Honestly, I find the "black character with the military background" almost more of a trope these days. It seems to be the most comfortable way to portray a strong black character - they can kick ass, but does (or did) so in a respectable way where they were part of a larger societal construct to uphold order and understand the chain of command. Every black character of note in the MCU is a military person (Fury, Falcon, War Machine, Monica - even Luke Cage was a former cop (which Misty also is) Even Heimdall's most notable quality was his self-professed loyalty to the throne and Valkyrie was, lost her way then came back) aside from the Black Panther cast, but they're royalty or serve royalty. Blade will be the exception when he shows up. (or will he?) On the DC side, John Diggle, Kelly Olsen, J'onn Jones (Martian, but still) John Stewart had a military background retconned in. Maybe it wasn't as much a trope then, but still...