It's Hartemis, or A/H. And if you check out Rocket's amazing comic (on deviantArt, she's called Axxonu) you'll see that they can make it work <3
And I ship A/H because I like complex pairings, where the couple have a lot of things they need to work out. They're from different species, there's the height difference, their personalities are very different, they had an old rivalry, from rivals to friends... what's not to love?
H/T is (personally) far too simple. Trouble doesn't have much depth as a character (in canon anyways), and he and Holly are far too similar. And a military romance - come on! They need to have more problems
All good fictional romances have problems that stand in the way of the couple's getting together, or working out. A/H has those problems. H/T doesn't. (And Rocket, if you're here - A/T has too may problems! Lol!)