Air Force Cryptolinguist training is up to 480 days[0]. So, someone out of high school can sign up to the Air Force and complete the training in a little under 2 years. Her first job as a cryptolinguist would be working at a DoD related agency working on TS material. So yes, you are asked to believe this because this is a common occurrence.
[0]https://www.airforce.com/careers/detail/cryptologic-language...