Hello,<br/>I read somewhere that if you say something like<br/><br/><u>Special effects supervisor</u><br/><br/>You should take out "s" and make it<br/><br/><u>Special effect supervisor.</u><br/></br>That is, make a plural word singular if it precedes a word like above.</br><br/>But why do movies use "special effects supervisor"?<br/><br/>Is there some rule on using "s" in this case?<br/><br/>Thank you.