Core Viewpoint - The U.S. government has clarified that the nuclear weapons tests ordered by President Trump are not nuclear explosions but rather "system tests" focused on subcritical testing [1][2]. Group 1: Nuclear Testing Clarification - U.S. Energy Secretary Chris Wright stated that the tests will not involve nuclear explosions but will focus on ensuring the functionality of nuclear weapons systems [2][3]. - President Trump announced on October 30 that he instructed the Department of Defense to initiate nuclear weapons testing in response to other countries' testing plans [2]. - Wright emphasized that the current discussions revolve around system tests, which include all aspects of nuclear weapons except for the actual nuclear explosion [2]. Group 2: Historical Context and Modernization - The U.S. has not conducted any nuclear tests since 1992, a ban established by congressional legislation [3]. - The last nuclear test occurred over thirty years ago at the Nevada test site, which now primarily relies on computer simulations rather than actual explosions [3]. - Wright mentioned that the U.S. is focusing on testing new systems as part of the modernization of its nuclear arsenal, ensuring that replacement nuclear weapons are more advanced and reliable than older models [3].