All male squads outperform all other combinations, so obviously something happens when you put women in with men (http://www.usatoday.com/story/news/nation/2015/09/10/marine-study-finds-all-male-infantry-units-outperformed-teams-women/71971416/).
The article mentions the obvious, like men are quicker across the ground and are generally more accurate with weapons. What I have also read elsewhere though is that men take more risks when women are in their squads and in danger, which of course puts everyone in the team in greater danger also.
So while I think women should absolutely be on the frontlines (as long as they have passed the same bar as the men, and it hasn't been lowered as it apparently has in some cases), I am not so sure about mixed units.







