This is so sad to hear. I went to MTV elementary for 6th grade and for 7th grade, was at Heidelberg High before the middle school was built in PHV (75-76).
I have great memories of basketball games in the gym, since I lived very close to the high school. Not to mention softball and Girl Scout camps throughout Germany. Dad had 3 other duty stations from 72-74, but Heidelberg was my favorite.