This Executive Order was posted on the WhiteHouse.gov web site on Friday, March 16, 2012, under the name National Defense Resources Preparedness. In a nutshell, it's the blueprint for Peacetime Martial Law and it gives the president the power to take just about anything deemed necessary for "National Defense", whatever they decide that is. It's peacetime, because as the title of the order says, it's for "Preparedness". A copy of the entire order follows the end of this story.
Under this order the heads of these cabinet level positions; Agriculture, Energy, Health and Human Services, Transportation, Defense and Commerce can take food, livestock, fertilizer, farm equipment, all forms of energy, water resources, all forms of civil transporation (meaning any vehicles, boats, planes), and any other materials, including construction materials from wherever they are available. This is probably why the government has been visiting farms with GPS devices, so they know exactly where to go when they turn this one on.
Specifically, the government is allowed to allocate materials, services, and facilities as deemed necessary or appropriate. They decide what necessary or appropriate means.
UPDATE: BIN reader Kent Welton writes: This allows for the giving away of USA assets and subsidies to private companies: "(b) provide for the modification or expansion of privately owned facilities, including the modification or improvement of production processes, when taking actions under sections 301, 302, or 303 of the Act, 50 U.S.C. App. 2091, 2092, 2093; and (c) sell or otherwise transfer equipment owned by the Federal Government and installed under section 303(e) of the Act, 50 U.S.C. App. 2093(e), to the owners of such plants, factories, or other industrial facilities."
What happens if the government decides it needs all these things to be prepared, even if there is no war? You likely won't be able to walk into a store to purchase virtually anything because it will all be requisitioned, "rationed" and controlled by the government. Construction materials, food like meat, butter and sugar, anything imported, parts, tires and fuel for vehicles, clothing, etc. will likely become unobtainable, or at least very scarce. How many things are even made here in the USA any more?