I've noticed some similarites between the procedures used by the British army for its conduct of trench raids during 1916-18 and current U.S. Army guidance for patrolling, especially as it is taught by Rangers. The areas where the procedures overlap concern the things leaders are supposed to do in the preparation phase before the operation -- junior officers and NCOs checking the amount of ammunition carried by soldiers, insuring that things like wire cutters, extra MG ammo, and so forth are being carried by designated personnel, and making sure things that could identify the raiding unit -- ID cards, documents, insignia, etc. -- are left behind for the operation. This is one of those little intuitions I occasionally have when reading military history that I have not followed up on with research that might prove that it's true. However, I suspect that parts of our patrolling doctrine came from things the British taught us in 1917-18.