My opinion is even if you can trust everyone to do their job, having a squad leader is just more efficient. Having one person, or two for that matter, in charge of relaying info and organising things is easier to handle. Chain of command. What if you are ambushed and you need to think of a plan? Even if you trust everyone to do their job, one person might think of a plan while another thinks of something completely different. Then where would you be?