Dominion autonomy after the Statute of Westminster

Could a Dominion under the 1931 Statute of Westminster declare war independently of Britain?

In law it could, but in practice its military and logistics remained too closely integrated with Britain for a wholly independent war to be realistic.

Legal capacity and usable strategic autonomy were different questions. Even after the Statute of Westminster, shared logistics and institutions made unilateral war against Britain's position extremely difficult in practice.