Move all data centers under Federal clouds (private like clouds for all Federal agencies, managed by one agency – physically spread out through out USA), we can make federal agencies (at least the civilian ones) use it on a pay and use basis. So, I am suggesting eliminating numerous agency specific data centers in the favor of one Federal cloud.
Some of the features will help in reduction cost are:
Pay only if used
Standardization will eliminate extra cost and increase efficiency
Huge power of negotiation
Technology upgrades will become less expensive
This will also increase performance, efficiency, reliability and security by placing the data centers in geographically spread out locations.