Although there was much official apathy toward amphibious operations, this began to change in the late 1930s. The Royal Naval Staff College at Greenwich, drafted a document detailing combined operations requirements and submitted it to the Chiefs of Staff in 1936. The document recommended the establishment of an inter-service 'Training and Development Centre', with a permanent force of Royal Marines attached to it. Its functions were to "train in all methods for the seizure of defended beaches; develop the materiel necessary for such methods, with special regard to protection of troops, speed of landing, and the attainment of surprise; and develop methods and materiel for the destruction or neutralization of enemy defenses, including bombardment and aircraft co-operation.