Gums, A4G pilots could be identified in the Nowra Mess by their constant Valsalva Maneuvering. Waking up with painful ears could be no joke but cleared by above. I was not particularly bothered by low altitude high G 'coughs' however one pilot was severely affected, causing our new flying doctor (qualified on A4Gs) to investigate, giving us a heap of info. When that pilot died in a TA4G crash into the sea in 1974 that 'cough' - as a cause - was investigated but discounted. RIP
The Kiwis had LOX in their original A-4Ks but at some time (maybe KAHU upgrade?) changed to a cabin air/oxygen combo - much like the Sea Venom/Vampire or Macchi MB326H.