On March 18, the U.S. Navy released its FY2020 budget proposal which indicated plans to develop an upgraded Standard Missile-6 (SM-6) variant, identified as the SM-6 Block IB. The missile will employ a larger 21-inch diameter motor, which will improve the missiles range and speed. It is scheduled to complete development by 2024.

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Navy To Supersize Its Ultra Versatile SM-6 Missile For Even Longer Range And Higher Speed, The Drive
Department of Defense Fiscal Year (FY) 2020 Budget Estimates– Navy Justification Book Volume 3 of 5– Research, Development, Test & Evaluation, Navy Budget Activity 5, U.S. Department of Defense, p. 814/2112

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