Up until the end of the Cold War, determining realistic orders of battle was generally an orderly but extremely frustrating process for NATO. Although the Warsaw Pact nations had well known doctrines, tactics, techniques and procedures; the characteristics of Soviet forces fluctuated often, significantly, and changes often went undetected for years at below-division levels. The intelligence situation for Western militaries has been exacerbated today as they continue to be become engaged in operations against non-traditional enemies (insurgents, guerrillas, etc.) and compiling orders of battle for irregular forces becomes very difficult; the equivalent military intelligence output requiring an increase in acquired data and analysis effort to provide an accurate and timely picture to the commander.