The Pentagon has completed initial draft plans (June 2018) for several emerging low-yield sea-launched nuclear weapons…–a low-yield sea-launched nuclear cruise missile and long-range sub-launched low-yield warhead still in development… The US Navy Plans to add a nuclear weapon to Virginia-Class Attack Submarines….
There are currently over 1,000 nuclear warheads in the US arsenal that have low-yield options. A yield is considered low if it’s 20 kilotons or less,” an essay from the Federation of American Scientists states….A massively smaller 5-or-6 kt warhead on a Trident would still bring the advantage of long-range attack, yet afford smaller scope, and therefore less destructive, attack possibilities….The 130,000-pound Trident II D5 missile can travel 20,000-feet per second, according to Navy figures. The missiles cost $30 million each…
Also, the now-in-development Air Force Long-Range Stand-Off (LRSO) weapon, an air launched nuclear cruise missile, will bring additional airborne attack options – particularly when it comes to areas well-defended by advanced, high-tech air defense systems, where stealth aircraft might have more difficulty operating. The LRSO, which could also be launched at farther stand-off ranges, is also designed for extremely high-risk areas armed with advanced air defense systems….
Excerpts from Pentagon completes draft plans for new low-yield sea-launched nuclear weapon, Fox News, June 5, 2018