From the EA forums: It seems that regenerating health is an option server admins enable or disable in Battlefield 3. you can see Zh1nt0's reply in the official EA UK forums
Isn't this called Hardcore mode? It's already in Bad Company 2.
Hardcore mode increases the damage of weapons to more 'realistic' levels ie. one hit sniper kills. My guess would be this gives the option of keeping damage the same but obviously just removing the regen.
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