Now, the great Sam Peckinpah was intensely fond of this particular term of endearment, and he used it whenever and wherever possible in his westerns. It turns up in both Major Dundee and in the Wild Bunch. So Bro. Makheru, in partial answer to your rhetorical kwestin, "why don't we hear black soldiers using these specific derogatory terms" - I'ma go with the answer "you better have been a very special brand of badass back in the day to have had the nerve and audacity to say it and live to tell of it", and, in consequence of this fact, it never caught on and became popular outside a small circle of intensely identified folk who LOVE to use these terms of endearment when they gather together to reminisce about the glory days of the early 70's.
quoth Bro. Makheru: “Where men are required to depend on one another, the spoken word doesn't even come from the same psychological spigot…” That is pure unadulterated, historically revisionist, bovine excrement!
Because I'm decidedly not a team player, you won't find me representing on behalf of either the Amerireich or the NBUF..., as a species-level guy, I find it preferable to observe and assess the antics of deuterostems in more universal and powerfully explanatory ethological terms, thus my preference for "killer-ape" on the small scale, "dopamine hegemony" on the largest scale, and global system of 1% supremacy to identify the controlling minority who rules it all.
quoth Bro. Makheru: The above mentioned derogatory words all come from the same psychological spigot--the spigot of white supremacy. Epithets don’t lose their meaning, particularly when a specific epithet is repeatedly used by the same group of people with violent intentions.
As the nominal and symbolic commander of the whole and entire machinery of global supremacy, the boss is not merely a figment of the imagination. The Hon.Bro.Preznit signifies where black Americans stand in the fourth and final quarter of this game. With nothing else left to prove. Everything else is - as they say - merely conversation.