2.5.4. Section 4: Final Recommendations. Same as the regular ICD with the addition of the “IT Box.” Discussion in this section should be tailored to the IS solution and focus on how the Sponsor intends to develop and deliver the required capabilities detailed above.

For reference or comparison, below is what the JCIDS Manual says for the ICD 2021 itself:

2.5.5.3.2. Replacement or recapitalization of a fielded capability solution(s) with significant capability improvement. The ICD will describe plans to retire fielded capability solution(s) as the new capability solution(s) is brought into service and whether quantities in the joint force should be reduced based on increases in capability.