Also, I get confused over the military divisions: Army, Navy, Air Force - land, sea, sky. Yet marines are either Navy men trained for land combat, or Army men trained for sea travel. Paratroopers are either Airmen trained for for land combat, or Army men trained for air travel.
With the growing recognition of the potential for aircraft as a cost-effective method of reconnaissance and artillery observation, the Committee of Imperial Defence established a sub-committee to examine the question of military aviation in November 1911. The following February the sub-committee reported its findings which recommended that a flying corps be formed and that it consist of a naval wing, a military wing, a central flying school and an aircraft factory. The recommendations of the committee were accepted and on 13 April 1912 King George V signed a royal warrant establishing the Royal Flying Corps.
The RNAS also had armoured cars and naval vessels, not just aeroplanes. They grew out of the RFC, which was developed for recon mostly, which in turn came from the Air Battalion (1911-1912), which came from the School of Ballooning (a training and test centre established in 1888).