Sorry if this has been answered somewhere else ...
OK, so William was born 21 Jun '82, which means that at the time he served in the South Atlantic, Andrew was 2nd in line to the thrown and was unlikely to be king unless something happenned to Charles.
Currently, Harry is 3rd in line and is unlikely to become king unless something happens to William.
What exactly is the difference between Andrew's circumstances in '82 and Harry's now?
Granted, the publicity would potentially be greater these days, but surely the opposition knew of Andrew's presence in theatre in '82 also?
I can understand the reason for denying William the opportunity to serve operationally, but why Harry?