To address your post directly:
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If you want to volunteer
http://www.uso.org/ways-to-volunteer.aspx
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Sorry did the rest of this on a tangent.
Being currently deployed therefore making me the authority.. here you go.
I go home soon tho and I'm still sooo excited
If you don't know the people or a person deployed and just want to help here are some links:
Cup of jo for a Joe
http://www.greenbeanscoffee.com/coj/
at some deployed locations there is a coffee hut and in it you can buy a deployed military member coffee.
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Operation Cookie Drop
http://www.girlscoutsww.org/cookies/operationcookiedrop
This through girl scouts of america you basically send cookies
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Send a USO care package
http://www.uso.org/operation-uso-care-package.aspx
This is a program through the uso to send care packages.
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If you want to volunteer
http://www.uso.org/ways-to-volunteer.aspx
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If you want to donate
http://www.uso.org/donatelanding.aspx
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If you are going solo wanting to put together a box than here are some pointers:
Each location people need different things. Some places have an abundant supply of things... others have 0. Thank You Cards and things of that nature are great.
Being currently deployed I found a nice mix of snacks to be the best. Like some sweet some salty. Things like sunflower seeds, chex mix, beef jerky, are in high demand. Tooth paste, tooth brush, deodorant, razors (mach 3), shampoos, and body wash. Twin Bed sheets pillow covers and pillows are awesome too. Magazines, books, movies all appreciated. Some people have portable dvd players ect.
With the shampoos you need to tape the tops down. With the mach 3 razor I'm gonna break it down like this. Unles it's a good razor I wouldn't send it. The amount of bic disposible razors that pile up is crazy. 4 mach 3 razors do more than one bag of 100 bic dipsosables. Don't pack anything that can melt.
If you know the person tho ask them! Some people would give there right arm for a laundry bag and Others for a loofa!