@cobrat. Excellent question. Certainly if this was a regular ( non military ) school, the students would have an excellent basis on which to fight the suspension on First Amendment grounds. I don’t know whether it’s status as a military academy changes that. Actual Military personnel do give up some of their rights. Someone with a more detailed knowledge of the Constitutional issues when military academies are involved needs to weigh in.
I know however @jym626 that it is IRRELEVANT that the Citadels code of conduct is violated in assessing whether disciplining students is Constitutional. The Us Supreme Court has made it clear that a school code can’t trump the Constitution. See. Papish v. Board of Curators of University of Missouri, 410 U.S. 667 (1973).
The Citadels code seems to say that students are to “revere God” Clearly that portion is unconstitutional if that were required even as to actual military personnel and any attempt to kick out a student who espoused atheism or made blasphemous remarks would be improper even though they student was"violating the code of conduct"