NASA isn't really looking for someone who can protect Earth from aliens.
There's been a lot of "clickbait" articles claiming that NASA is attempting to fill a position meant to protect Earth from extraterrestrial threats. This is false; really just second rate websites looking for ad revenue. NASA is just trying to fill its Planetary Protection Officer position. This is the job that makes sure unmanned probes don't contaminate other worlds with our germs. So basically, they aren't looking for a "Men In Black" agent. They're looking for someone who makes sure that our germs don't become an alien superbug that infects another world.
I though so too. Job details here, plus send your resume if you want to work for NASA. I know guys who complain that this position needs to exist because it could get in the way of deep space manned missions. Robert Zubrin (yeah, the Mars Society president) is one of them. But what I think is that this position is going to exist until diplomats get off their duffs and renegotiate international agreements related to activities in outer space. The NASA position isn't new; it's existed for decades. The European Space Agency has a planetary protection officer too.