Well, I like Stryker. Ammo is nice too, but not as strong sounding if you have to call it out loud, lol.
I've always favored 2 syllable names, and ones that should be emphasized on any one syllable, and starting with a consonant, not a vowel.
Sparta would be good for a female GSD, as it ends with the vowel a which tends to soften the name, to me it sounds feminine.
Rouge doesn't appeal to me, but since it's just my opinion, feel free to ignore it!
I suggest, if you haven't already done this, to speak each of these names out loud, shout it, say it softly, and see which one sounds better to you both.
Good luck finding your perfect pup!