Although neither of the canine's had never even shot a gun, both showed great prowess in the training process. Shadow's natural born leadership surprisingly got him the position of colonel, with him leading the entirety of the special ops, while Trevor became a Staff Sargent, unofficially becoming Shadow's second in command. Because of his pack background and high intelligence, Shadow broke the mold for most military leaders. Not only did he take care of the strategic side of the operations, he also led the unit in battle. The duo was successful but nothing as of note had occurred for the years that they had been in the service. But one day in 2049 would alter their future forever...

In an attempt to foil a slight uprising in Poland, the Vipers were called to an area that was being controlled by some German morons that took a liking to the now much further outdated ideals of fascism. Yes, Americans were fighting Nazis again. On a cool December day, word came that the entire headquarters of this uprising had been found, and on a dangerous recon mission, Both Shadow and Trevor went to the town. They did not plan on anything more than gain strategic info, but upon seeing the town undermanned, the duo decided to do the next best thing, completely liberate the entire town all by themselves. Trevor took a sniping position in a water tower on the outskirts of the town, which gave him an entire view of the place. Shadow was walking straight to the headquarters with no regards for anything he saw. The only thing he had was two frags and an AK12. The mission was simple, kill everyone and everything in sight. By the end of the day, Trevor had killed 23 and Shadow had amassed 38, and the entire coo stopped with the work of these two. This day gave them their nicknames, Shadow being Colonel Killer and Trevor being Sargent Snipes. In 2050, they both received the Presidential Medal of Honor for their efforts. They settled back down in Adventure Bay, hanging out and being bored of the peace. This led to them causing havoc around town for the Paw Patrol, who knew of the two, but could not catch them being overall nuisances. But a change in the Paw Patrol roster would change their lives forever.