This must expire after February 15, 2013. If you do not have one you must be willing and able to get one before you purchase your tickets.
You will need two letters of reference from mature Brothers or Sisters in good standing (non-family members) which should address both your strengths and anything they think might be a challenge for you on this project (socially, physically, emotionally, spiritually). Have them email these directly to nicabuild2012@gmail.com. Your application can not be considered until these arrive, and your application does not meet the deadline if a reference is still missing at that time.
I have read and agree with the statements here