There's a huge amount of radio spectrum out there, and in the US there are almost as many licenses as there are radio bands. Here's an explanation of which licenses cover what, and which bands do what. Now you can make your own band plan and start building your communication plan.

2:05 FRS
2:59 GMRS
4:54 MURS
6:05 Marine and Aviation
7:08 Amateur Radio Bands
9:53 Ham Radio Testing
13:30 Business Band Radio
17:45 The Grey Areas
20:50 The Citizens Band
25:20 Having a Communication Plan