Yeah, I include the last one mostly as a lark. What I'm serious about Steve is that neither he nor Etta should be in any military (or para-military) bureaucracy. Steve being a former member is fine (he can even be in active service when he crashes on Themyscira), but being active is problematic both due to the current role that the US plays in world politics right now, and due to the way that it tends to distort and limit the role he plays in the stories.
Instead, I see him as a daring pilot who works with various humanitarian efforts, bringing in supplies and relief/rescue workers, and bringing out refugees from disasters and conflict zones. He can still have plenty of contacts in the military, and possibly also in the US State Department (as their alternative backdoors route to Wonder Woman and the Justice League when they believe ARGUS and the military are about to screw things up). I'm also inspired by the real-life diplomat
Harald Edelstam, who carried the badass nickname of "The Black Pimpernel" due to his role smuggling Norwegian resistance fighters to Sweden during the Second World War, and later saved over a thousand of people during Pinochet's coup in Chile with nothing but attitude and a diplomatic passport. That puts Steve as a person who both does admirable work, gets in trouble on his own, but also provides a skill set that can help Diana.
(Ie, I'm the opposite of many posters here who wants to increase the presence of ARGUS in the Wonder Woman title; I want it to appear less, and then probably more often in a neutral/adversarial role than as a semi-permanent ally.)
Etta I see as more of an artsy type, being similar to movie Etta in that she seems like an airhead but in reality is an excellent organiser. She also has above-average combat skills, and is very cool in combat situations. (For those who have read the Miles Vorkosigan books—very much recommended—think of her as one of the Koudelka sisters in a fight.)