Maybe they'll teach you more next year in third grade.
US Too Dependent on Russian Rocket Engines, Experts Tell Lawmakers
"Should the Russian government yank its supply of rocket engines for United States launches, critical national-security satellite missions could be delayed up to four years, experts told a joint Senate hearing Wednesday (July 16).
United Launch Alliance's (ULA) Atlas 5 rocket is the workhorse of heavy satellite launches in the United States, but the booster requires a Russian RD-180 engine to get off the ground.
Recent geopolitical disputes between Russia and the United States have thrown this arrangement, which has been in place for decades, into turmoil. In Twitter remarks in May, Russian Deputy Prime Minister Dmitry Rogozin threatened to ban all sales of RD-180 engines to the United States intended for use in military launches."
U.S. military, national security agencies vexed by dependence on Russian rocket engines - The Washington Post
American spy satellites and classified military spacecraft are routinely launched into orbit with help from Russian rocket engines developed in the Soviet era. That is no secret to anyone in the world of national security space launches.
The big question is whether this intimate technological relationship can continue given the political fallout from Russiaís actions in Ukraine. Already, a top Kremlin official has threatened to ban the export to the United States of powerful RD-180 engines unless Russia is guaranteed that they wonít be used by the U.S. military.
U.S. military officials and space-industry experts say itís high time the United States had an industrial base that produced rocket engines that can do what the Russian engines do. Congress is in the process of authorizing money for such an effort. In theory, itís a no-brainer: Why rely on Russians for such an integral element of the U.S. national security program?
But everything is highly inertial in the world of rocket science. The creation of powerful rocket engines in the United States could take several years at least. If the supply of Russian engines were cut off in the meantime, the U.S. launch program would face delays, with attendant costs to taxpayers of billions of dollars, according to a recent U.S. Air Force study"