zeta beta tau students are being investigated for the ` disgusting ' acts .
have been accused of the deplorable acts at the warrior beach retreat .
is designed to give ex-servicemen a relaxing break in panama city , florida .
university of florida and emory university branches were there at the time .
they allegedly ripped flags off cars and threw items off balconies .
three students from university of florida have been expelled .
both fraternities have suspended all of their university activities .