The [[United States]] is modernizing its entire triad—replacing Minuteman III with Sentinel ICBMs, Ohio-class SSBNs with Columbia-class, and developing the B-21 bomber. This program is a one-for-one replacement of existing platforms, maintaining current warhead levels without quantitative expansion. | The [[United States]] is modernizing its entire triad—replacing Minuteman III with Sentinel ICBMs, Ohio-class SSBNs with Columbia-class, and developing the B-21 bomber. This program is a one-for-one replacement of existing platforms, maintaining current warhead levels without quantitative expansion. |