The pentagon's Secretary of Defense Chuck Hagel's proposed budget would, according to the proposal, shrink the Army to 450k or to levels that existed just before the United States entered into ww2.
The plan is to fill the void with hi-tech devices that have proven themselves reliable but for the most part, more of these devices can be fielded with far fewer personnel.
Weapon platforms are not exempt either. The U2 and A10 are well known weapon and surveillance systems, but rising costs of manufacture and maintenance plus the need for a human in the seat throughout the mission.
Naval systems like the Littoral Combat Ship, a new modular naval vessel capable of light combat, anti submarine / mines etc, all with a modular design and an equally small crew, possibly as few as 88. Another example is the new Zumwalt destroyer. This vessel can go to sea with a crew of apx. 150 where the aging Ashleigh-Burke fields 300 with almost no automation. The Popular Science article is very good and informative. You Can Read The Whole Article Here