This isn't an edict like the US Marines "the Corps says you have to have entertainment". Formal ceremonies (such as the ones given when a course is completed, ranks are put into effect [officer's courses] and the like may have some kind of musical addition, even if it's only someone singing the National Anthem. Such ceremonies are mandatory for all course participants, and the musical aspect is a minor one, often almost an afterthought. Forty years ago, when I took my oath of service on Masada, and when I completed the recon sergeant's course a year later, no one complained about women singing and no one walked out of either ceremony. This issue is an attempt at a power play by one particular rabbi who apparently wants to exert his authority in a place where he should have no authority.
EU demands zero tolerance towards settler violence; urge Israel to protect Palestinians (Haaretz)