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The astronautix ref/website lists 6 variations proposed or costed by Boeing. Only one of the variations 'MLV with LFBB' has flyback liquid fuel boosters. 3 (MLV-SDV-1a, MLV-SDV-1b, MLV-SDV-2) use solids and 2 (MLV-SDV-3 & MLV-SDV-4) use non-flyback liquid-fuel boosters. Need a NASA or Boeing ref to confirm. - Rod57 (talk) 11:28, 16 April 2020 (UTC)[reply]