Then this November, Diller proposed splitting IAC into five parts that would use a single-tiered voting structure, thus reducing Liberty Media's hold on the company by almost half to 30%.

FORBES: Diller Won't Go Quietly From IAC

This past November, Diller proposed splitting IAC into five parts that would use a single-tiered voting structure, and breaking out some of the less appealing businesses from the remaining IAC.

FORBES: IAC Is A-OK

Interestingly, Mr. Davis has cited the importance of layered or "tiered" defense among his rationales for restarting the canceled E2I secondary interceptor for the single ground-based defense site he advocates -- despite the fact that the E2I system does not represent an independent layer.

CENTERFORSECURITYPOLICY: Center For Security Policy