One has only to look at tanks like the M3 Stuart with people around them: http://afvdb.50megs.com/usa/pics/m3stuart.jpg http://afvdb.50megs.com/usa/pics/m3stua

One has only to look at tanks like the M3 Stuart with people around them: http://afvdb.50megs.com/usa/pics/m3stuart.jpg http://afvdb.50megs.com/usa/pics/m3stuart.jpg It has a crew of 4. I believe you can see the driver & codriver through the viewports under the turret. Then compare to an M1: http://www.cybermodeler.com/armor/m1/images/m1_002.jpg http://www.cybermodeler.com/armor/m1/images/m1_002.jpg I wish I could find a photo of them side by side