All the talk about undercover stuff is missing the point that there are already women trained and operating in that exact role. They work alongside the other units as and when required. The primary wartime role of the two main SF units require those strength and endurance attributes that typically only men have.
Yes, Paula Radcliffe would most likely beat every badged bloke in a race. But most likely not with a pack, webbing, body armour, weapon etc., and not for multiple days in a row.
Th current system has worked well, the women have done a great job in their roles. Let them try and pass if they want but lowering standards does no one any favours.