I'm removing all of the high tier infantry squads, in fact I'm removing all infantries that can't drive.
I would advice against it, I am a couple of missions ahead of you, trust me especially the rangers you want to keep, especially for their close combat skill.
Later you can get plasma weapons for your infantry squads and the plasma assault rifle makes the founder infantry squad pretty strong.
Also so far I haven't had a single opportunity to get any other founders squads, so if they are gone, they are gone.
Get them the wasteland survivor skill, ASAP, it reduces their supply cost by 20%.