WARNING: The following contains spoilers for Cable Reloaded #1, on sale now from Marvel Comics.
Cable has always been somewhat confrontational with the heroes of the modern era. Having grown up in a dark and desolate future, Cable is typically unimpressed with the heroics of the modern day, outside of a few very specific exceptions. In fact, his recent resurrection following his death (and replacement) allows Cable to reveal that there's one space-faring non-human hero he's always had a deep fondness and respect for.
In Cable Reloaded #1 (by Al Ewing, Bob Quinn, Java Tartaglia, and VC's Joe Sabino), Nathan Summers is recruited to help fight in The Last Annihilation, and revealed his deep-seated respect and admiration for Rocket Raccoon of the Guardians of the Galaxy.
Following the events of Cable #12, the younger incarnation of the titular time-displaced mutant hero has returned to his proper place in the time-stream. In his place, Krakoa has regained the older incarnation of the character, who swiftly joins up with S.W.O.R.D. as their Head of Security. This means he's also returned just in time to take part in the events of The Last Annihilation, an attack by Dormammu against the rest of the universe that threatens to wipe out all of existence. Chafing under the command of Abigail Brand, Cable learns that he's been assigned to a plan designed by her and Rocket Raccoon to steal powerful weapons from Breakworld that could make their mission to bring down Dormammu much more likely to succeed.
Cable realizes that only a tactical genius could earn the respect of Brand, and discovers that the genius in question is Rocket Raccoon. Used to being on the receiving end of odd looks from humans, Rocket tries to get ahead of the jokes he expects to come from the earthling. Instead, he's caught off-guard when Cable rises to his feet and salutes him, telling Rocket that it will be an honor to fight alongside him. As it turns out, Cable -- and the rest of humanity from the future he grew up in -- consider Rocket to be something of a folk hero. His actions during the Last Annihilation apparently make Rocket a universal legend, and Cable's sheer excitement at working with him is infectious.
Brand and Rocket reveal that since no ship can approach Dormammu in his current form of possessing Ego the Living Planet, they're going to cheat by procuring a series of powerful weapons. The entire time, Cable thinks to himself about how excited he is to be a witness to this moment in galactic history, and how excited he is to work with Rocket. It's a fun revelation and one that fits perfectly with Cable's established history and personality. Cable has always been a tricky leader, a tactician, and soldier above anything else. It makes him an ideal ally for Rocket, considering their similar approaches to battle.
The pair also both have a deep-seated appreciation for giant guns. They're both also somewhat aggressive when compared to their teammates, and quick to decide explosives are the best route to go when dealing with problems. It's always entertaining and interesting to discover what heroes actually inspire one another -- from Punisher's surprisingly reverent views on Captain America to the way the rest of the hero community will fight tooth and nail to help the Thing in a crisis. Cable having such deep respect for Rocket is a great addition to the character, and a perfectly fitting one as well.