Save your money up during Basic and AIT, and continue saving for about six more months after, get a nice down payment. Plus, what if you get stationed over seas?
Once you have saved, look for deals on the truck. You'll have about $1100 after taxes and can easily live off of $100 a month. Which mean not much of a night life.
Don't forget to factor in gas, insurance, and maintenance
U.S.Army Disabled Veteran
19K20 M1A1 Abrams MBT