There's a $30,000 sign-on bonus for the OS rate and I'm curious to know how much I should expect to get from it after it's taxed? My dad says I'd get $18,000 out of it. Also, am I able to get any return on however much the taxation is at the end of the year or each year? 

All bonuses are taxed at 28%. You will receive a lump sum payment of $21,600 on your paycheck after graduating A-School. Getting money back for taxes at the end of the year completely depends on how you file your taxes and which allowances you claim.

Thank you so much for the reply jdhusker! I asked you all because I had misplaced my cell phone and wasn't able to ask my recruiter. I wasn't able to see your response until today as my internet was down for a couple or few days. I asked him today before seeing this and he mentioned it's taxed at 22%. However, he didn't know that I could get a return on it depending on how I file. So, thank you for that info!