2016-10-22t074320z_2_lynxnpec9l03d_rtroptp_4_usa-nuclear-future

2016-10-22t074320z_2_lynxnpec9l03d_rtroptp_4_usa-nuclear-future

US Defense Secretary Ash Carter testifies before a Senate Armed Services Committee hearing in Washington on National Security Challenges and Ongoing Military Operations on September 22, 2016. Photo: Reuters/Yuri Gripas

October 22, 2016 4:22 PM (UTC+8)