You're again giving some strong manosphere podcast vibes here.

The US failures in Iraq and Afghanistan are no more due to women than the US failure in Vietnam was due to men.

If grip strength is so important, then test for that. The military can easily do that at the recuitment center.

Otherwise it's the social phenomena known as sexism. That means rejecting a professional lumberjack simply because she's a woman, while accepting a less capable man because you've got a recuitment quota to meet.