From the Document: "Congress sets compensation levels for members of the armed forces through statutory authorizations and appropriations. When people talk about military pay, they are often only referring to 'basic pay.' Although basic pay is normally the largest component of cash compensation that a servicemember receives, there are other types of military pay and allowances that add significantly to it, and tax benefits as well. 'Regular Military Compensation' (RMC) is a statutorily defined measure of the cash or in-kind compensation elements which all servicemembers receive every payday. It is widely used as a basic measure of military cash compensation levels and for comparisons with civilian salary levels. For 2019, a mid-grade enlisted servicemember (E-5) received an annual average of $35,785 in basic pay, but an average of $64,544 in RMC."
CRS In Focus, IF10532
Congressional Research Service: https://crsreports.congress.gov/