Strongest? The strongest, without question, are the USAF's three missile wings, each composed of three squadrons with 50 Minuteman III missiles each.
In compliance with the New START Treaty of 2011, each missile is fitted with only one warhead, the 300-475 kiloton W87 thermonuclear warhead. The Minuteman is capable of launching 10 such warheads.
That's 450 warheads. 450 cities. The most lethal of all US military forces.
Minuteman was never capable of carrying 10 warheads. The most they could carry was on the Minuteman III which lifted up to three warheads.
Only the Peacekeeper (known as the MX missile to most everyone) which the U.S. deployed only 50 of in Minuteman silos for a few years (now withdrawn from service) could carry 10 warheads. The 500 W87 warheads mounted on the Peacekeepers were then mounted as single warheads on the surviving Minuteman IIIs..
And anyway, the W88 warheads carried on the Trident II missiles aboard the Ohio class ballistic missile submarines would probably be considered far more dangerous than the W87s mounted on the Minuteman due to superior accuracy.