Military Readiness: Actions Are Needed to Enhance Readiness of Global Response Force to Support Contingency Operations, Report to Congressional Committees [open pdf - 757KB]
"DOD must be able to rapidly deploy forces to respond to a range of worldwide contingencies, and in 2007 it established the GRF [Global Response Force] to enhance that capability. The GRF is a set, or 'menu,' of forces from the military services, each of which possesses unique capabilities, and which the Secretary of Defense can deploy rapidly anywhere in the world. House Report 114-537, accompanying a bill for the National Defense Authorization Act for Fiscal Year 2017, included a provision for GAO [Government Accountability Office] to evaluate challenges DOD may be facing regarding the GRF. GAO reviewed the extent to which (1) DOD has used the GRF, and assessed any risks associated with its use of the GRF; and (2) GRF-assigned units are trained to meet GRF missions individually and as a joint force. GAO reviewed GRF deployment information from 2010 to 2017 and the GRF Execute Order, observed a training exercise, and interviewed knowledgeable officials. [...] GAO recommends that DOD (1) assess the risks assumed in its reliance upon the GRF as both an augmentation capability and a tailorable joint force; (2) design appropriate responses following the risk assessment; and (3) designate an authority to establish and enforce integrated joint training as appropriate for GRF-assigned units. DOD concurred with GAO's three recommendations."
Government Accountability Office: http://www.gao.gov/