I'm in the military, and I understand your situation. I have more than once found myself in a leadership position among my peers, it is indeed very difficult. As a person who has encountered this situation here is what I advise:
1) Be fair - this is above all else important, don't ever ask more than you yourself are willing to give, this shows them that you respect them, and don't consider yourself "better" just because you are in charge. Also, fairness is important so that people don't undermine you. Always treat everyone equally, and never ask more than you would be willing to give.
2) Be respectful - Appreciate your workers, praise them when they do well, and critisize in a manner that is not confrontational or belittling. If someone is out of line, explain what you expect and how you would like things to go. Always show them that you repect them and are concerned about their well-being.
3) Be consistent - Let them know work is work, and play is play. You can joke around, when the time is appropriate, but when it's time to work, work hard. Explain that you like to have fun as much as anyone else, but when things need to get done, get them done. Also, if you expect them to be working, make sure you're working too, that way it they respect you for your work ethic as well.
and finally
4) Be Open - Let them get to know you a bit, if you're on lunch, or on a break, get to know them, and be open in return. Ask them about their lives, families, kids, hobbies, etc. People generally like to talk about these things, and it's a good way to show that you're interested in knowing them as people. If they ask you about your life as well, be open in return. You don't have to divulge things that are too personal, but the basics are great.
Those are ways that you can relate to your workers, and they can relate to you. However, be careful to be fair. If some workers don't get along with you, make certain that you treat them the same as you do any friends you might have, fairness is so very important! Also, you could provide some extra-cirricular activities, maybe get the guys together for a BBQ, or something like that. Not only does that create a bonding experience among the workers, and improve morale, but also it lets them get to know you in a relaxed atmosphere.
Hope these help, and good luck!