They have the absolute right to freedom of speech. However, no such right to federal funding exists, particularly in wartime. I'm convinced even FDR would agree.
With freedom comes responsibility and accountability. The U.S. taxpayers whose income is garnished in part to support these institutions should NOT be forced to pay those who support their murderers.
Until such time as these skinwasters learn manners, the military will, I'm sure, find good use for the extra funding.