From the Document: "Congress has expressed concern regarding the growing threat to U.S. national security posed by a resurgent Russia and China. The Army contends in order to address this threat, it must be able to operate in a multi-domain '[air, land, water, space, cyber, information]' environment which requires new operational concepts, technologies, weapons, and units. The Multi-Domain Task Force (MDTF) is the Army's self-described 'organizational centerpiece' of this effort. [...] MDTFs are intended to support freedom of action of U.S. forces. MDTFs are to be scalable from operational to strategic level and can be modified to support the needs of Joint Force Commanders."
CRS In Focus, IF11797
Congressional Research Service: https://crsreports.congress.gov/