The OODA Loop is known in business and in warfare. It was originally devised by John Boyd, a USAF officer who was active in the Korean war and who later earned the moniker 40-Second Boyd for his supremacy in simulated air-to-air combat. Boyd revolutionised both aerial combat training tactics and fighter plane design, recognising that quickness, manoeuvrability and superior visibility were a more successful combination than bigger, stronger and more technologically advanced aircraft. US pilots benefited from improved design that allowed for better lines of sight, and as a result were able to process more data more quickly, which could be turned into an advantage against opposition. Boyd later formulated this insight as the OODA Loop, an acronym for Observe, Orient, Decide and Act. In this pictorial series, assembled from the collection of the Archive of Modern Conflict, the OODA Loop is tested and demonstrated with reference to imagery from many sources, arranged in 16 sets of up to 16 images apiece, beginning with a set of towering cloudscapes, part of the habitat of pilots.