[sliverstorm]

One has only to look at tanks like the M3 Stuart with people around them:

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

I wish I could find a photo of them side by side

[noir_lord]

Yup not to mention the modern stuff is climate controlled and has better ride quality all important for endurance especially when sealed up or in a NBC situation