Look very carefully at the C of MMMC. I cannot find anything Brazilian with PMMC
BUT
Could it be a "G"? The bottom right corner seems somewhat more squared off than the corresponding corner on the C of Escola (btw, could that be Escolar)
If so, then it's Policia Militar Minas Gerais (a Brazilian state)
Military Police of Minas Gerais State - Wikipedia
and the list of police units confirms that there is no M..C..