boolean retval = this.troops.remove( unit );
boolean retval = this.troops.removeElement( unit );
    public boolean unload( Entity unit ) {        // Remove the unit if we are carrying it.        boolean retval = this.troops.remove( unit );        // If we removed it, restore our space.        if ( retval ) {            this.currentSpace += unit.getWeight();        }        // Return our status        return retval;    }