In World War I, aircraft were deployed during early phases of battle in reconnaissance roles as 'eyes of the army' to aid ground forces.[2] Aerial reconnaissance from this time through 1945 was mostly carried out by adapted versions of standard fighters and bombers equipped with filmcameras.[3] Photography became the primary and best-known method of intelligence collection for reconnaissance aircraft by the end of World War II.
World War I also saw use of floatplanes to locate enemy warships. After the battle of Jutland demonstrated the limitations of seaplane tenders, provisions were made for capital ships to carry, launch, and recover observation seaplanes. These seaplanes could scout for enemy warships beyond the visual range of the ship's lookouts, and could spot the fall of shot during long range artillery engagements. Observation seaplanes were replaced by helicopters after World War II.[4]