@Override public boolean unload(Entity unit){
  boolean retval=troops.removeElement(unit.getId());
  if (retval) {
    currentSpace+=1;
    unloadedThisTurn+=1;
  }
  return retval;
}

@ Override public boolean unload ( Entity unit ) { boolean retval = troops . removeElement ( unit . getId ( ) ) ; if ( retval ) { currentSpace += 1 ; unloadedThisTurn += 1 ; } return retval ; }
unload the given unit .
