(2) The term LOX-Methane Assessment working group means the ongoing interagency working group studying the explosive characteristics of liquid oxygen and methane and comprised of representatives from the Department of Defense, the Department of Transportation, and the National Aeronautics and Space Administration. (3) The term launch vehicle has the meaning given such term in section 50902(11) of title 51, United States Code. 1602. Classification review of space major defense acquisition programs Chapter 135 of title 10, United States Code, is amended by inserting after section 2275a the following new section: 2275b. Requirements for appropriate classification guidance. (a) In general Before a space major defense acquisition program achieves Milestone B approval, or equivalent, the milestone decision authority shall determine whether the classification guidance for the program remains appropriate and— (1) if such guidance is determined to be appropriate, submit to the congressional defense committees a certification of such determination