What’s Going On At The Portland, Maine (PWM) Airport?

Anybody know what's going on at the Portland airport?  A friend was running...for fun...near/around PWM when she discovered these jets.  For all intents and purposes, we will refer to these as nothing more than 'jets' because I don't know the fancy schmancy military names for them.  

Should I start stocking my pantry?  Run for the hills?  Every man for himself, sort of, situation?  If you know what this is about, comment below or on our Facebook.