Springs, some questions for you!
1. Is the army/government response one that base on today's reality, or do you have a UFO hunting department who actually believe in extraterrestrials and would stop at nothing to get to the site because they know that there is something very important?
2. Is the story set today, in the world of twitter and facebook?
The first question is important because if you want to do a real government response there won't be a big concerted effort to find anything (I believe the UK government currently takes the view that UFO's are atmospheric phenomena of some unknown scientific process, and are not of any threat to national security). That does not mean they would not come out in force - it depends on the circumstances - if the crash was reported as an air plane crash, seen by official people or quite clearly caused a lot of damage. Yes then they could well be out in force. (but not looking for aliens.) On the other hand if you have a fictional branch of the army as alien hunters, then they would probably there quite quickly - unless they are useless! So it depends on how far from reality you want to take the government!
The second question is relevant I think, because in the past people phoned the emergency services and news on 'strange things' happening got to official quite quickly (usually not really taken seriously of course, but the reports are there.) Now I think people will be more likely to post things
immediately on twitter or post pictures on facebook and elsewhere. 'OMG seen bright light in sky hit behind hill.' etc...
If you have a government response that is lukewarm, 'cause it don't believe in extraterrestrials (at first!), and an amateur group who are responding instantly to the twitterati/internet (maybe one of your team is a conspirational techie who follows such things online and can pinpoint where all the reports are coming from?) Then I personally could buy that the amateurs get there first.
You may be interested in an article on a 'real UFO crash in the UK' that occurred in the Berwyn mountains in 1974. The article I have is from the
Fortean Times* #252 (August 2009) p30 - it's written by Andy Roberts. At the moment the latest version I can find of it online is an older 2001 version that doesn't have all the info that the '09 version has. Essentially he tells the myth, then examines what really happened - including what the government response at the time was (and also what army responses were to other events that may help you decide on a response.) Unfortunately the 2009 version is, I think, better but I'd have to type it in and send it to you at the mo'. Tell us what you want: This is the 2001 one to whet your appetite.
http://www.uk-ufo.org/condign/berwart.htm
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* p.s. This sort of story is bread and butter to Forteans like me, as it's part of the vast amount of stuff that the said
Fortean Times regularly dips into with glee - I have to say I'm quite surprised that no one here on Chrons seems to read this brilliant magazine. [Note to Brian - this is not an advert
. Purely my personal view!] UFO's, ancient mysteries, ghosts, faeiries and folklore, monsters, black magic, Fortean literature and huge amounts of all sorts of weirdness - that really help me (at least!) as a SF&F writer. Can be serious (science-y or arty), always fun and generally on the sceptical side of issues but it is welcoming on a broad range of stances (best if you are at least willing to suspend your belief and develop an open approach.)