If you're expecting to dissect some alien corpses or check out a spaceship, you might be a bit disappointed. For the most part BETA has spent time planning and preparing for possible situations and making a think tank to create all sorts of contingencies. The aliens didn't really give much to go off of, other than some idea of their form and some implications of their technological ability seeing they managed to translate some parts of the interstellar dialect despite seemingly limited contact.

BETA is a secret organization that pretends to be SETI-like in nature, they are overall a alien affairs organization, but the actual focus is far more on protecting humankind from something that was thought impossible to exist so near.

You likely would if you applied be part of the facade of naive outward looking folk who assume peace- or the part of BETA that hopes for the best. BETA proper is far more preparing for the worst. They also of course, have a secret agent vibe to them as once the aliens are easier to investigate, attempts inevitably will be made to get as much data as possible. However, depending on how things go, BETA easily can become 100% BETA proper or keep with the facade. 

BETA's planning has had some impact- it's that planning which explains some of the weird things the grand coalition started doing over the past twenty years.

In short, BETA may be preparing, but in terms of knowledge of the nature of the aliens, even BETA proper knows little more than a civilian does about them other than the messages and the forms from signals it should be noted, very much were directed at Vestiva.