What are some good financial tips for a young enlisted US Army soldier?

Party within reason, (believe it or not, partying gets old and expensive)
Don't buy a new car get a good used on that you can pay off with 2 or 3 years
Don't get married too soon. It's a lifetime/lifestyle expense!
Use your TA college money don't wait until you get out.
Eat at the chow hall more than eating out
Do you really need a $1,000 phone?

Do not get married and save your money.

don't lose anything you are signed for.

1. Don't buy a car without your NCO's advise and consent.
2. Don't buy a car within cab distance of base.
3. You don't owe anyone at home a big chunk of your paycheck unless it is court ordered.
4. Get your spending spree out of the way. Get your computer and the TV too big for your barracks room as soon as you can pay CASH for them. Then stop spending.
5. You don't need the newest iPhone. By the time you can afford it through savings a newer one will come out. It is OK to skip a version.
6. The Snap On truck guy is not your friend.
7. Start an allotment now for a savings/ retirement fund. If you don't get used to seeing it on payday, you won't miss it.
8. If you meet a local of your the gender(s) you are attracted to that seems to be racing you to the courthouse to get married, tell them that you will consider it after the relationship has gone through at least one deployment. Not field exercise, not some TDY trip, a full on deployment. If a deployment isn't available do a Korea and return. It sounds like a huge requirement, but please trust me on this. You will find out more about him/her and their commitment to you through a deployment.
9. "Those establishments" are only for entertainment. It's part of the act.

Take advantage of the resources available on base, and join USAA.

Take it slow. Watch your finances and keep your uniforms up to inspection first. Make no what seem to be rational moves for the first year. Like buying a car/motorcycle. Write to home as much as you can. Remember these people you meet are acquaintances like people at work in the civilian life. Don't lend or borrow funds, it only brings hurt. Save as much as you can. Think weather you like this job and want to ride it out or get out when your time is up. Good luck and Thank you.

Pay yourself first, have a set amount of your pay go directly into some sort of savings account. 10% is a good amount to set aside and be consistent do it every payday. If you can put away more for a rainy day by all means do. Don't get into debt. It's OK to have a credit card, but don't carry a balance pay it off every month (find one that gives you cash back on your purchases). The only thing worth paying interest on is a house, save and pay cash for everything else. Buy used cars and let someone else take the initial bite on new ones. Lease returns and program cars are good deals and still have some manufacturers warranty left. Don't pay for extended warranties on appliances, cars, etc. The chances of you needing them before the run out are slim, and they will normally cost you more in the long run than the repair you may need.

Watch your credit- save your money, stay away from credit cards and places near the Post.

Don't go into credit card debt! Don't impulse buy. Get into the habit of saving a litle each month, the amount isn't as important as the routine. When I left for basic in 1969 my dad gave me a piece of advice to always have at least $20 in my wallet the day before payday. Big bucks for an E-1 in those days, but I was never flat broke.

It's simple - live within your means. Just because you're now "employed" you don't need that fancy new car, or video game, or to constantly "treat" your comrades to a round on you.