Prince William holds the rank of Captain in the Blues and Royals, Lieutenant in the Royal Navy and Flight Lieutenant in the Royal Air Force.
Police constable
The rank Captain doesn't exist in the RAF the equivalent rank is Flight Lieutenant, but basically, yes, the army would have to follow the order given to him by a superior officer. This is the same for all ranks of all services.
Rupert Brooke held the rank of sub-lieutenant in the British Royal Navy Volunteer Reserve during World War I.
Lieutenant Colonel insignia is identified by a Silver Maple Leaf. In the US Army it is a cluster of silver OAK leaves. In the British army it is a crown and a single 'pip'.
In the British Army, Field Marshall is the highest rank. 2nd lieutenant Lieutenant Captain Major Lieutenant Colonel Colonel Brigadier Major General Lieutenant General General Field Marshall
Lieutenant is a higher rank then Sergeant. The Lieutenant is a Commissioned Officer and the Sergeant is the Non-Commissioned Officer.
There is no such rank as Lieutenant Corporal.
Lieutenant-Colonel
Yes, newly commissioned officers are commissioned as Second Lieutenants.
The Royal Air Force rank of Air Marshal is equivalent to Vice-Admiral (Royal Navy) and Lieutenant-General (British Army and Royal Marines).
In the British Army, the rank of captain is an officer rank that comes after the rank of lieutenant and before the rank of major. It is typically held by individuals who have completed their initial officer training and have gained some experience in their respective unit. Captains are responsible for leading a company or equivalent-sized unit.