MD SB 167 provides that Active duty members of the US armed forces and Honarably discharged vetrens residing in Maryland also be exempted in paying the nonresident tuition rates.
MD SB 167 does not require a MD state income tax to qualify for the student resident tuition rate, but says that if as individual, or an individual's parents or legal gaurdians have MD state tax information, that information be provided to the "communitity college" being applied to.
http://mlis.state.md.us/2011rs/bills/sb/sb0167t.pdf