question [published in 1968-78] fall into two distinct classes: works aimed at a popular readership, written by journalists and men of letters outside academic circles, and professional work nearly always produced within the military establishment.... The study of military history in universities remains seriously underdeveloped. Indeed, lack of interest in and disdain for military history probably constitute one of the strangest prejudices of the profession. In recent decades University level courses in military history remain popular; often they use films to humanize the combat experience. For example, Eugene P. A. Scleh, history professor at the University of Maine, has explored the advantages and problems of teaching a course of "Modern War and Its Images" entirely through films. Students said they found the documentaries more valuable than the dramas. However, military historians are frustrated by their marginal status in major history departments. Historiography of military history Historiography is the study of the history and method of the discipline of history or the study of a specialised topic. In this case, military history with an eye to gaining an accurate assessment of conflicts using all available sources. For this reason military history is periodised, creating overlaying boundaries of study and analysis in which descriptions of battles by leaders may be unreliable due to the inclination to minimize mention of failure and exaggerate success. Military historians use Historiographical analysis in an effort to allow an unbiased, contemporary view of records. One military historian, Jeremy Black, outlined problems 21st-century military historians face as an inheritance of their predecessors: Eurocentricity, a technological bias, a focus on leading military powers and dominant military systems, the separation of land from sea and recently air conflicts, the focus on state-to-state conflict, a lack of focus on political "tasking" in how forces are used. If these challenges were not sufficient for the military historians, the limits of method are complicated by the lack of records, either destroyed or never recorded for its value as a military secret that may prevent some salient facts from being reported at all; scholars still do not know the exact nature of Greek fire for instance. Researching Operation Enduring Freedom and Operation Iraqi Freedom, for example, have presented unique challenges to historians due to records that were destroyed to protect classified military information, among other reasons. Historians use their knowledge of government regulation and military organization, and employing a targeted and systematic research strategy