F-4J(UK) Phantoms
... that the F-4J(UK) Phantoms used by the Royal Air Force were so different from other British Phantoms, they even required crews to wear American flying helmets?
... that the <b id="mwCeU"><a class="mw-redirect" href="./McDonnell_Douglas_F-4_Phantom_II_in_UK_service" id="mwCeY" rel="mw:WikiLink" title="McDonnell Douglas F-4 Phantom II in UK service">F-4J(UK) Phantoms</a></b> used by the <a href="./Royal_Air_Force" id="mwCec" rel="mw:WikiLink" title="Royal Air Force">Royal Air Force</a> were so different from other British Phantoms, they even required crews to wear American <a href="./Flight_helmet" id="mwCeg" rel="mw:WikiLink" title="Flight helmet">flying helmets</a>?