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:

2.5.5.3.4. Increase integration/interoperability to evolve and combine existing and new systems to create a synergistic SoS. Examples include creating joint integrated kill chains for air and missile defense or integrated SoS for creating layered defense designs.