After her orphanage years, Sparky applied for the Equestrian Army. Due to her size, the officers originally rejected her application. However, due to her persistence, the officers approved her application on the condition that she must pass all physical fitness tests in Basic Military Training (BMT). To the surprise of many, she managed to get a distinction for the physical fitness tests and survive the tough training that BMT had to offer. Due to her height, she was given a child's uniform and was forbidden from taking part in the Graduation Parade. This is because it might seem that the Equestrain Army is using children as soldiers (which will be a bad PR since they have just concluded a war not long ago) and maybe because she is not a pony. She is posted to serve in the Navy as a Diver since her build was meant for water.
It will be in the Navy that she has a first 'friend': The Commander of ESS Bismarck. Bismarck was the ship sent to hunt for Sparky by the Humans. When it arrived in Equestria, it was intercepted by the Equestria fleet. The Commander agreed to work with the Equestrian Navy until she could finish her original mission. When Rachel saw Sparky on the docks, Rachel recognized her instantly and tried to get close to her. The directive given to her was to destroy the egg, now, after 18 years with the Equestrian Navy, Rachel lost hope in finding the creature. Rachel expected Godzilla's daughter to be at least 100 feet (30.48m) tall. But seeing a 2 feet tall creature is probably not what she imagined the creature to be. Rachel thought it was a coincidence and a chance to eradicate her. As she gotten to slowly know her as a creature, she slowly started to forget about her mission and be a true friend to Sparky. After all, the daughter of Godzilla woundn't be as kind and nice and as short as Sparky right?