If your seeking employment, you might want to check out NASA's job listings.
They're looking to hire a "Planetary Protection Officer," someone to guard the planet from "organic-constituent and biological contamination in human and robotic space exploration."
Part of the job description is to make sure humans don't contaminate space as well as making sure other organisms don't contaminate Earth either...Hmmm, did NASA just confirm aliens too?!
At least when your fighting aliens you get compensated well, the annual salary is $127,000!
Source: Twitter