; and (iii) by striking critically ; (B) in subparagraph (A)— (i) by striking in a particular cyberspace-related field and inserting in such designated field ; and (ii) by striking operational ; and (C) in subparagraph (B)— (i) by striking in a cyberspace-related field and inserting in such designated field ; and (ii) by striking operational ; (2) by striking paragraph (2) and inserting the following: (2) The amount of constructive service credited an officer under this subsection may be up to, but may not exceed, the amount required in order for the officer to be eligible for an original appointment in the grade of colonel in the Army, Air Force, or Marine Corps or captain in the Navy. ; and (3) by striking paragraph (4) and inserting the following new paragraph: (4) In this subsection, the term designated field means any of the following: (A) Cyberspace. (B) Any scientific or technical field designated by the Secretary of Defense. (C) Any other field designated by the Secretary of Defense as being a high-skill, difficult-to-fill field. . (b) Reserve active-Status list appointments Section 12207 of such title is amended— (1) in subsection (a)(2), by inserting or (g) after subsection (b) ; (2) in subsection (e), by striking subsection (b) or (d) and inserting subsection (b), (d), or (g)