My lay observance is many soldier's are stronger+heavier than WWII for example. Strength doesn't quite offset the increased body weight effects when it comes to

My lay observance is many soldier's are stronger+heavier than WWII for example. Strength doesn't quite offset the increased body weight effects when it comes to running medium to long distances. So typically you'd be right, but recently I think we're selecting for strength which requires higher bodymass more than in the past.