Whats in a name
"Aggressor" seems like a fine name for a lightweight, longrange vehicle, at least as a codename for a prototype... whether the army even buys into this vehicle and still decides to keep that name is very much up for grabs. I bet they name it after someone famous, like the Bradley vehicle or the Patton tank (and both of those guys were pretty damn aggressive, I've heard). Aggression wins wars, there is no way around that, but it doesn't imply whether the war is just or not...
And the Crusader howitzer is more likely to have been named for the Allied liberation of Europe than the knights-and-horses version (assuming its named after any event at all, not just a cool term)- in the immortalized words of Gen. Eisenhower: "You are about to embark upon the Great Crusade... ...The hopes and prayers of liberty-loving people everywhere march with you".