2.5.1. Section 1: Operational Context. No change from a regular ICD to the operational context section in the IS-ICD.

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

2.5.2.4. Identify the timeframe under consideration for IOC and FOC based on input from supported/supporting CCMDs and the acquisition community. The timeframes presented must be consistent with the DoDAF CV-3 and any phasing of capability proposed in Section 3 of the ICD.