I like Serrano. (I also think she has the coolest surname there, even if I'm not certain it really has anything to do with serrated, as in the edge of a blade, but it makes for a nice connotation.)
Also, just to pester CP, I went and looked up Duane. Turns out it's from the Irish, Dubhán, and that, I'm afraid, is the most unprounceable-looking name I've seen in awhile. Poor guy would spend his entire life being irritated at people saying his name as "dub-HAN" or even "dubbin". Cripes. Although now I know where the DU-waaaayn comes from, because a variant of Duane is Dewayne, a spelling I have seen amongst midwestern classmates (but a spelling you almost only see amongst black city-raised midwestern, like Chicago, folks). And apparently Duane has a whole lotta variants, more than most names, but I've found that Irish/Gaelic tends to do that, since it's not like anyone can figure out how to say it in the original, let alone translate it into anything vaguely romance-based: Dewain, Dewayne, Duante, Duayne, Duwain, Duwaine, Duwayne, Dwain, Dwaine and Dwayne.
Also, similar sounding names: Dane, Deane, Doane, Dunne and Dwane, and I'm now thinking that Dunne is a pretty cool name, actually. I think I'll save that one. (I love the name Dane, but I've avoided it myself since so many of my characters are, uhm, Danish, and it seems kinda bizarre to name your kid Dane when he's already a Dane, though I guess it's not really something anyone actually Danish would ever consider, and I'm just wierd that way.)
Hrm, I don't know how French military does it (I would guess similar) but amongst US military folk, the surname is used almost exclusively even among really good friends. You get so used to saying "Lt Keller" and "Colonel Greer" and so on, that to speak informally (as friends) is to drop one's title -- so it becomes Keller and Greer. If you're speaking informally but aren't necessarily good friends, then you drop the surname and use only the title, as in "Lieutenant," or "Gunny" or whatever. I've met (military) folks who do that to my father, calling him "Colonel," even though he's been retired for a good long while now. I guess after long enough, it does kinda become part of your name, and your identity. After four years (or more, in Anderson's case, I guess) of being called "Private Keller" daily, Keller's going to answer to "Private" just as fast as "Keller", and may have learned to associate "Duane" only with his parents or siblings, because none of his military cohorts would've used his first name except in very rare circumstances.
You even noted that, that they're uncomfortable using anything but military euphemisms -- this is even more true of their own (military) names. Thing is, these personalities are NOT Marine personalities, but it's the Marines that are the only branch that only accepts volunteers -- that is, in time of war you cannot be drafted, ever, into the Marines. I'm not sure if that's a point for you -- if these guys were volunteers, then saying they're all Marines makes it clear (at least for US audience) that they were NOT forced or even pressured into enlisting. If you want to imply they were drafted, even in a round-about (aka pressured) way, then make them Army, not Marines. If you want to imply they signed up as volunteers and aren't too bright, either (because that's what it takes to get ahead in the Marines, honestly: be a little crazy, a little dull, and not the most imaginative) then go for Marines.
And if you want to imply more than a little crazy, possibly a bit unconventional at times, and willing to try anything once, then go with Navy (as in Navy SEALs and Special Ops). Those guys are whacked. Honestly.
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Also, just to pester CP, I went and looked up Duane. Turns out it's from the Irish, Dubhán, and that, I'm afraid, is the most unprounceable-looking name I've seen in awhile. Poor guy would spend his entire life being irritated at people saying his name as "dub-HAN" or even "dubbin". Cripes. Although now I know where the DU-waaaayn comes from, because a variant of Duane is Dewayne, a spelling I have seen amongst midwestern classmates (but a spelling you almost only see amongst black city-raised midwestern, like Chicago, folks). And apparently Duane has a whole lotta variants, more than most names, but I've found that Irish/Gaelic tends to do that, since it's not like anyone can figure out how to say it in the original, let alone translate it into anything vaguely romance-based: Dewain, Dewayne, Duante, Duayne, Duwain, Duwaine, Duwayne, Dwain, Dwaine and Dwayne.
Also, similar sounding names: Dane, Deane, Doane, Dunne and Dwane, and I'm now thinking that Dunne is a pretty cool name, actually. I think I'll save that one. (I love the name Dane, but I've avoided it myself since so many of my characters are, uhm, Danish, and it seems kinda bizarre to name your kid Dane when he's already a Dane, though I guess it's not really something anyone actually Danish would ever consider, and I'm just wierd that way.)
Hrm, I don't know how French military does it (I would guess similar) but amongst US military folk, the surname is used almost exclusively even among really good friends. You get so used to saying "Lt Keller" and "Colonel Greer" and so on, that to speak informally (as friends) is to drop one's title -- so it becomes Keller and Greer. If you're speaking informally but aren't necessarily good friends, then you drop the surname and use only the title, as in "Lieutenant," or "Gunny" or whatever. I've met (military) folks who do that to my father, calling him "Colonel," even though he's been retired for a good long while now. I guess after long enough, it does kinda become part of your name, and your identity. After four years (or more, in Anderson's case, I guess) of being called "Private Keller" daily, Keller's going to answer to "Private" just as fast as "Keller", and may have learned to associate "Duane" only with his parents or siblings, because none of his military cohorts would've used his first name except in very rare circumstances.
You even noted that, that they're uncomfortable using anything but military euphemisms -- this is even more true of their own (military) names. Thing is, these personalities are NOT Marine personalities, but it's the Marines that are the only branch that only accepts volunteers -- that is, in time of war you cannot be drafted, ever, into the Marines. I'm not sure if that's a point for you -- if these guys were volunteers, then saying they're all Marines makes it clear (at least for US audience) that they were NOT forced or even pressured into enlisting. If you want to imply they were drafted, even in a round-about (aka pressured) way, then make them Army, not Marines. If you want to imply they signed up as volunteers and aren't too bright, either (because that's what it takes to get ahead in the Marines, honestly: be a little crazy, a little dull, and not the most imaginative) then go for Marines.
And if you want to imply more than a little crazy, possibly a bit unconventional at times, and willing to try anything once, then go with Navy (as in Navy SEALs and Special Ops). Those guys are whacked. Honestly.