You obviously haven't read the true story of what happened for the U.S.S. Vincennes. There is a lot of heated debate about whether is was a set up by the government of IRAN, or an error on the part of the ships technology. This wasn't terrorist attack. Huge difference between a terrorist...
1. Retirement from the military is only after 20 years of service.
2. Social Security is deducted from your pay and counts towards your benefit when you reach retirement age of 67.
3. If you don't do the full 20 years in the military there is no benefits except possible VA benefits for G.I. Bill...