The "Guarding Readiness Resources Act" proposes to amend title 32, United States Code, to establish clear guidelines for handling funds reimbursed to the National Guard Bureau by states and territories. This legislation specifies that any funds received from a State, the Commonwealth of Puerto Rico, the District of Columbia, Guam, or the Virgin Islands as reimbursement for the use of military property must be properly credited. Specifically, these funds shall be credited to either the appropriation, fund, or account that incurred the original obligation, or to an appropriate, currently available account for the same purposes. Crucially, the bill mandates that these reimbursed funds may only be used by the Department of Defense for functions directly related to the assets used by National Guard units. This includes the repair, maintenance, replacement, or other similar functions of equipment utilized while operating under state active duty status, thereby ensuring resources directly support National Guard readiness.