Two PDFs are attached here. The first is the handout for a class on the Byzantine military. The second is a local-newsletter article, from a decade earlier, which had better explanatory text.
Numerous caveats provided in the class may not be apparent from the PDFs. The Byzantine army of the tenth century was not the Byzantine army of the eighth century was not the Byzantine army of the twelfth century, etc. Military writers prefer to explain how a 25,000-man army should be organized and how it should be handled in a major field battle, but enormous armies fighting major field battles are an exception - and often a sign that someone has made a bad mistake. Byzantine military success rested as much on knowing how to recruit, train, and feed an army. It often rested too on knowing when to threaten and when to bribe.