I completely understand the position you are in because something very similar happened to me years ago. I, however went about it the wrong way so I highly recommend you don't.
Please find this very simple code of ethics below:
o bring blessing on yourself, bless your neighbor.
o enrich yourself, enrich your neighbors.
onor your neighbor and your neighbor will honor you.
o sorely hurt yourself, hurt your neighbor.
e who seeks love will find it by giving it.
he measure of a man's wealth, is the measure of the of the wealth he has given.
o enrich your yourself with many friends, enrich your friends with yourself.
hat which you take away from any man, the world will take away from you.
hen you take the first step to give yourself to that which you want, it will also take the first step to give itself to you.
eace and happiness do not come to you from your horizon. They spread from you out to infinity beyond your horizon.
he whole Universe is a mirror which reflects back to you, that which you reflect into it.
ove is like the ascent of a high mountain peak. It comes ever nearer to you as you go ever nearer to it.
Lao Russell's Code of Ethics
I hope you find the above inspiring.
Now, you should handle this matter like a gentleman and none other than that. The toughest thing for anyone to do is to turn the other cheek and go the extra mile. It's easy to react violently and it's even easier to cause damage to him, but this will in no way effect him positively. Remember, for every action is a reaction and it's your next action that will either cause a positive or a negative reaction from Philip. To harm him, you harm yourself. To harm his property you harm you're own. The damage is done, now it's up to you to rise above the situation and lead by example.
Again, this isn't easy... matter of fact, it isn't something that is practiced by the majority because our first and initial reaction is to take his head and mash it into the locker he has stolen from. What would his reaction be then? How would it make you feel? Chances are that he has done other things like this in his life before and the reactions of those he's hurt have been to hurt back. So a negative action and reaction only provides more seeds of negativity... so in essence, he won't learn a lesson, he'll just get worse.
You are in a position of great opportunity to provide Philip an environment for growth and in doing this, you'll also grow. Anything that happens to you in your life, whether it be your kevlar being stolen or someone punching you in the noggin, there is an opportunity for something very positive to come out of it. It's up to you to make the best of the situation. For everything in life that happens that is negative, there is an equal or greater positive in the same transaction. This isn't just some sort of philosophical insight, this is from experience. The choice is yours my friend. Would you rather invoke negativity or positivity? Come from a position of Love and watch how it all works out. Then when you become an officer you can make him do push-ups.
As for your helmet... If you know the gentlemen that buys these helmets, you may go to him and let him know that your helmet was stolen and sold and that you need a helmet. If he doesn't sell it back to you, turn the other cheek and go and but a new one.
Oh, please don't follow Refus advice. :p LOL. ...
Thank you for coming here and asking our advice. That's a step in the right direction for certain and this means you are thinking rather than reacting. Good for you.
Thank you also for protecting our way of life. Whether we agree with the war or not, we all appreciate that you guys are over there protecting our way of life. We wish you well and America can't wait for the day where we can be at peace and our troops can come home. Thank you!
If you truly cannot afford a helmet and you've risen above the situation at hand, I'm certain we can pull together, in this forum enough donations to provide you a helmet. Just PM me if you need this assistance and we'll get it taken care of.