If an extra-terrestrial ship appears in US skies what is the official USAF response protocol?

The aliens might think your appendages, eyes, ears, hair, skin, etc. are threats.
A rattlesnake doesn’t carry additional weapons, but from a human POV it doesn’t have to. It’s perceived as a threat by its very nature.

Seren-fucking-Dipity[sup]TM[/sup] !

[Can you solve some of the world’s biggest UFO mysteries? Rare microfilms of alien sightings are now available online for free

The files relate to USAF investigations into UFO from 1947-1969
They were conducted under ‘Project Blue Book’ which ended in 1970
More than 700 cases remain unsolved, accounting for 5.5% of the files

By ELLIE ZOLFAGHARIFARD FOR DAILYMAIL.COM
PUBLISHED: 19:31 EST, 13 January 2015 | UPDATED: 00:57 EST, 14 January 2015](Rare microfilms of alien sightings available online at Project Blue Book for free  | Daily Mail Online)

vomit-comet looks like a newbie who’ll be sticking around for a while. I, for one, welcome vomit.

Why, thank you good sir.

This is probably the busiest board I’ve been on, lots of names to remember.

Maybe we could have the kid from the offensive fart thread to have a go at them and then let the chick with the stool finish them off.

Or make them deathly ill with some sort of organism and then sign them up for Obamacare, that should finish them off.

Hey newbie, prepare for The Voice of the Mods on this one. Just a heads up.