Which level of command utilizes part one of the war plans additive requirements report (WPARR)?

The major commands (MAJCOMS) are the correct answer because they play a critical role in the strategic planning and resource allocation for military operations. Part one of the War Plans Additive Requirements Report (WPARR) specifically focuses on the requirements and recommendations at the higher echelons of command, which includes the major commands. MAJCOMS assess and synthesize the data from various units to formulate comprehensive strategies ensuring that sufficient assets and support are available to meet operational needs.

By gathering information from various operational and support units, MAJCOMS can effectively utilize the WPARR to identify shortfalls and additional requirements necessary for executing military plans. This capability allows them to propose adjustments or enhancements to ensure operational readiness and efficacy on a larger scale.