A comprehensive introduction to military operational law is presented in a new edition of the Operational Law Handbook (pdf) published by the U.S. Army Judge Advocate General.
The Handbook, intended for the use of judge advocates, describes tactics and techniques for the practice of operational law.
Along the way, it provides a useful survey of the laws of war, human rights law, prisoner detainment policy, the use of contractors alongside military forces, and intelligence law, among other topics.
“Because intelligence is so important to the commander, operational lawyers must understand the basics of intelligence law, including how law and policy pertain to the collection of human intelligence, such as interrogation operations,” the Handbook states.
See “Operational Law Handbook,” The Judge Advocate General’s Legal Center and School, July 2007 (667 pages, 6 MB PDF file).