It all depends on what master's degree you're looking to get. I'm currently attending Florida Institute of Technology, which is convenient for me since their classes are at the Frank Knox school right outside Gate 2 of Pax River NAS or on-line. Excellent instructors and convenient class hours (5 - 8) - at least for me!
UMUC, where I got my bachelor's degree, also has good master's degree programs down here. There are quite a few others universities at SMHEC, but I found most were geared towards teaching degrees. Again, it depends on what you're interested in.