The water ice and other lunar resources that will help the United States establish a long-term human presence on the moon are there for the taking, the White House believes.

President Donald Trump signed an executive order today (April 6) establishing U.S. policy on the exploitation of off-Earth resources. That policy stresses that the current regulatory regime — notably, the 1967 Outer Space Treaty — allows the use of such resources.

This view has long held sway in U.S. government circles. For example, the United States, like the other major spacefaring nations, has not signed the 1979 Moon Treaty, which stipulates that non-scientific use of space resources be governed by an international regulatory framework. And in 2015, Congress passed a law explicitly allowing American companies and citizens to use moon and asteroid resources .

Related: The search for water on the moon (photos)

The new executive order makes things even more official, stressing that the United States does not view space as a "global commons" and sees a clear path to off-Earth mining, without the need for further international treaty-level agreements.

The executive order, called "Encouraging International Support for the Recovery and Use of Space Resources," has been in the works for about a year, a senior administration official said during a teleconference with reporters today. The order was prompted, at least in part, by a desire to clarify the United States' position as it negotiates with international partners to help advance NASA's Ar temis program for crewed lunar exploration, the official added. (Engagement with international partners remains important, the official said.)

Artemis aims to land two astronauts on the moon in 2024 and to establish a sustainable human presence on and around Earth's nearest neighbor by 2028. Lunar resources, especially the water ice thought to be plentiful on the permanently shadowed floors of polar craters, are key to Artemis' grand ambitions, NASA officials have said.

The moon is not the final destination for these ambitions, by the way. Artemis is designed to help NASA and its partners learn how to support astronauts in deep space for long stretches, lessons that will be key to putting boots on Mars, which NASA wants to do in the 2030s.

"As America prepares to return humans to the moon and journey on to Mars, this executive order establishes U.S. policy toward the recovery and use of space resources, such as water and certain minerals, in order to encourage the commercial development of space," Scott Pace, deputy assistant to the president and executive secretary of the U.S. National Space Council, said in a statement today.

President Trump has shown considerable interest in shaping U.S. space policy. In December 2017, for example, he signed Space Policy Directive-1 , which laid the groundwork for the Artemis campaign. Two other directives have aimed to streamline commercial space regulation and the protocols for space traffic control. And Space Policy Directive-4, which the president signed in February 2019, called for the creation of the Space Force , the first new U.S. military branch since the Air Force was stood up in 1947.