[LT Guppy]

Short answer - nope, no care packages in boot camp, just letters. Small pictures are generally ok too.

Long answer - for a while, Operation Homefront was providing care packages for recruits. I'm not sure if this program is still going on.
While generally families cannot send anything other than letters and small photographs, *if* a recruit specifically asks for something (like shoe insoles) you can send it because (in theory) they have permission to receive it. But don't try to sneak anything else into the package.