You might be able to get the question answered by reading your merit scholarship fine print, I know I noticed this in the wording for my daugters going to University of Arizona (not for ROTC FYI), it says specifically not usable for room and board, and not for use with an ROTC scholarship. Yes call financial aid and find out there should be a financial aid counselor that handles all ROTC students.
It really is crazy how it varies. My daughter's academic scholarship to Arizona State (same Board of Regents as UofA) goes to cover her room and board with no issue whatsoever.
Had my son selected WVU, his academic scholarship would have gone to room and board there as well.