I’m not certain but I don’t think “soil” is a primary condition in this.
It is the “in service to the USA” that makes it legit.
McNoName’s daddy, although working for a private company, was “in service to the USA” because he was also an intelligence asset reporting back to the State department.
The research threads about 0bola that went on for several years hashed this all out.
Jus soli and jus sanquinis were both required at the time of the writing of the Constiution to qualify someone as a NBC.