Pushups will work your triceps, back and chest.
If you are unable to access some freeweights then here is an excercise that will allow you to isolate them. Take two chairs and place them close together. Place a hand on the seat of each chair (make sure they will not fall over on you). Suspend yourself by your hands with your arms only holding you up. Keep your legs extended with your feet together and toes pointed to the ceiling. Then lower yourself approximately 6 inches (depending on how long your arms are) and come back up. You should feel an nice burn after about 5 of these. This will work your back, chest and triceps as well but wth more emphasis on your triceps.
Yes, most lightpoles used for electricty, cable and telephone are approximately 75-100 feet apart.
I personally would not run in combat boots. Trust me, when/if you get in you will have plenty of chances then. If you want to run with the weight get some of the 1-3lb ankle weights that some people use when running/walking.
Combat boots are not designed for running. They do not have the proper support and cushion that your joints need when running long distances and could very well cause you longterm pain.
Even in the USMC there is a Marine Corps Order that states you will run no more than one "boots and utes" run per 30 days as a unit or section.
One other thing, you can probably go to the salvation army or some yardsales or such and find some really cheap freeweights. I know I had picked up the old plastic wrapped concrete kind at a yardsale for 15 bucks for the set. Just an idea.
I am like Radio Shack. You have questions? I have answers!