In a report to Congressional Requestors the Government Accountability Office (GAO) reports the Army Range Requirements Model (developed and maintained by R&K Engineering) provides a consistent and reasonable framework for Army headquarters, major commands, and installations to use to calculate training land requirements. 

ARRM is an integrated, automated planning tool that models training throughput requirements for live fire training and maneuver events for all Army installations that are managed by the Army’s Sustainable Range Program (SRP).   ARRM is used by range and training land managers at all levels, from the individual installation range manager to the range program managers for the various Army Commands and HQDA, to determine the unconstrained doctrinal requirements for ranges and training.  It also allows comprehensive "what-if" analysis of the impact of re-stationing actions on live training infrastructure.

Read Appendix II from GAO-09-32 January 13, 2009