In A15.1 there is this sentence, "The Heat of Battle DRM for a broken unit applies even if the unit rallied as a result of the 2 DR which allowed the Heat of Battle DR." I realize the OP's question had to do with a NMC interdiction, not a Rally attempt. But if there is a broken 7 ML MMC under DM, in rally terrain with a 7-0 leader, it would rally on a DR of 2 or 3. If the rally DR is a 2, it would rally and then qualify for the HOB DR but still use the +1 DRM for having been broken. Therefore, on a FINAL HOB DR of 6 or less, 5 or 6 (Edited) the now rallied unit creates Hero and Battle Hardens. Unless I am missing something?