You say that as though him supporting Leave is cast iron support for the idea that it will happen, which would have course be a ludicrous thing to say. An ex-military chief supports Brexit, joining some others who do (for sometimes idiotic reasons*)... whilst many don't, and others support Bremain. An EU army won't happen for the same reason there's never been a NATO army, or a UN army (even though one was initially envisioned, political reality meant it never happened).
*By idiotic reasons I mean, for example, General Sir Michael Rose saying,
"European law, in my view, has already seriously undermined UK's combat effectiveness as a result of the intrusion of European law into national law and today our service men and women are in danger of becoming no more than civilians in uniform"
Where, imo, he's clearly crying about ECtHR/ECHR... when the ECtHR/ECHR is a different institution and thing to the EU.
If their reasons for supporting Brexit are like that quotation, then lol at those doddery old men who clearly don't understand the issues around this referendum, even if their military knowledge and records are top notch.
Maybe we should play Top Trumps?
Key Bremain military people,
Field Marshal Lord Bramall, former Chief of Defence Staff
Field Marshal Lord Guthrie, former Chief of Defence Staff
Admiral of the Fleet Lord Boyce, former Chief of Defence Staff
Marshal of the RAF Lord Stirrup, former Chief of Defence Staff
Admiral Lord West, former First Sea Lord
Admiral Sir Mark Stanhope, former First Sea Lord
General Sir Mike Jackson, former Chief of the General Staff
General Lord Dannatt, former Chief of the General Staff
General Sir Rupert Smith, former Deputy Supreme Allied Commander Europe
General Sir Richard Shirreff, former Deputy Supreme Allied Commander Europe
Lieutenant General Sir John Kiszeley, former Director General of the Defence Academy
Lieutenant General Sir Rob Fry, former Deputy Chief of Defence Staff
Key Brexit military people,
Maj-Gen Julian Thompson CB, OBE
General Sir Michael Rose KCB CBE DSO, QGM
Lt-Gen Jonathon Riley CB DSO
Maj-Gen Tim Cross CBE
Maj-Gen Nick Vaux CB, DSO
Maj-Gen Malcolm Hunt OBE
Vice Admiral Sir Jeremy Blackham KCB
Maj-Gen Malcolm Hunt OBE
Rear Admiral Roger Lane-Nott CB
Rear Admiral Conrad Jenkin CB
Rear Admiral Richard Heaslip CB
Commodore Mike Clapp CB
If you like higher ranks go for the first lot, if you like rears then the latter.