For the United States, 3 answers, depending on what you mean. First, the President is constitutionally the Commander-in-Chief. Under the George W. Bush Administration, all other uses of "commander in chief" at lower levels was ended. The chain of command, by law, is through the Secretary of Defense to the commanders of the so-called combatant commands (e.g., the European Command, the Central Command). The Joint Chiefs of Staff (see below) can be thought of as off to the side, administering but not commanding the Armed Forces.
Second, the highest ranks currently found in the U.S. Armed Forces are General (Army, Air Force, Marines) and Admiral (Navy), i.e., the 4-star ranks, designated O-10 (i.e., 10th pay grade of officers). There is a "secret" "4-1/2" star rank, sometimes designated O-10S, for the commanders of the combatant commands and the chiefs of staff. U.S. law establishes 5-star ranks - General of the Army, General of the Air Force, and Fleet Admiral, which can only be granted in wartime. The last 5-star, Omar Bradley, died in 1981. There are historically higher ranks, General of the Armies (held by Pershing) and Admiral of the Navy (held by Dewey) but these have no established pay or devices.
Finally(!), the most senior actually serving officer in the U.S. Armed Forces is the Chairman of the Joint Chiefs of Staff, currently 4-star Admiral Mike Mullen.
For the United Kingdom, H.M. The Queen is the head of the Armed Forces, but in name only. The most senior officer is the Chief of Defence Staff, currently Air Chief Marshal Sir Jock Stirrup, who is equal in rank to a 4-star U.S. Air Force general. The highest ranks established for the British armed forces are Field-Marshal, Admiral of the Fleet, and Marshal of the Royal Air Force, but these are now to be granted only in wartime.
For Canada, the nominal head of the Armed Forces is the Governor General (who indeed is styled "Governor General and Commander in Chief of Canada") but the most senior military leader is the Chief of Defence Staff, currently an Army general, equal in rank to a U.S. 4-star general. General and Admiral are the highest military ranks established in Canada.
In many parliamentary democracies with the chief-of-staff system that Britain and Canada use, the question of who's in charge is a bit muddy. The head of state is often the nominal head of the forces, but the prime minister and defence minister are really in charge.
But many countries, especially outside the developed countries, have a commander-in-chief system where some general or admiral or air marshal is indisputably in command of the armed forces.
For ranks, you can peruse www.uniforminsignia.net, and Wikipedia has quite a few accurate articles surveying the subject - start with "Field Marshal".
highest command would be a general. It could be a brigadier, lieutenant, or major general but most likely general. but there are 2 different rankings. higher up in the ranks are officers like:
and lower down in the rankings are enlisted members like:
so in the officers the highest officer positoin in a war would be a general. but the highest enlisted member would be a command chief master sergeant.
This is how the ranks break down lowest to highest, at least it was when I retired.
Commissioned Officers
2nd Lieutenant
1st Lieutenant
Captain
Major
Lieutenant Colonel
Colonel
Brigadeer General
Major General
Lieutenant General
General
Enlisted
Airman Basic
Airman
Airman first class
Non Commissioned Officers
Buck Sergeant ( I think this one was eliminated )
Staff Sergeant
Technical Sergeant
Master Sergeant
Senior Master Sergeant
Chief Master Sergeant
Chief Master Sergeant of the Air Force
As of May 2015, Gen Martin Dempsey, U.S. Army, is the Chairman of the Joint Chiefs of Staff, making him the highest-ranking American military officer. His replacement was announced in March 2015, and will be Gen Joseph Dunford, USMC
Admiral Michael Mullen is the current (2010) Chairmen of the Joint Cheifs of Staff making him the highest ranking military officer.
The General.
Lt. Gen. Terry L. Gabreski
A person that is chief of a army group ( The leader ).
General Robert E. Lee was the leader of the Confederate army. He was considered the best trained military man at the time.
The Speaker of the House is the highest ranking member of the majority party, currently Paul Ryan. The highest ranking member of the minority party is the Minority Leader, Nancy Pelosi. There is not a minority Speaker of the House.
Isoroku Yamamoto .
the president is the commander in chief of all military forces but there is a commandant of the marine corps and he/she is the highest ranked officer on active duty the last one i knew was general Michael hagee but im sure it changed now
The highest ranking military official is Thomas de Maziere, the German defense minister. The highest ranking military leader under him is the chief of staff, General Volker.
A person that is chief of a army group ( The leader ).
Robert E. Lee
General Robert E. Lee was the leader of the Confederate army. He was considered the best trained military man at the time.
caudillos is spanish for a political military leader at the head of an authoritarian power
No, an official state of war does not have to exist for the president to be called the commander in chief. The title of commander in chief is a constitutional position that designates the president as the highest-ranking military officer and leader of the armed forces, regardless of whether the country is at war or not. The president's role as commander in chief is not dependent on the declaration of war.
The highest ranking member of the majority party in the House of Representatives is the Speaker of the House. The party with the most seats in the US Senate, elects a "majority leader".
Leader of the country military forces
Every military must have a leader, Canada is no exception. The current Chief of Staff is General Walter Natynczyk
Ulysses Grant
Luxembourg's prime minister is jean- claude juncker and the highest ranking court judge is Walter p. Disney
The Speaker of the House is the highest ranking member of the majority party, currently Paul Ryan. The highest ranking member of the minority party is the Minority Leader, Nancy Pelosi. There is not a minority Speaker of the House.