George Washington was the first president to command the army, but there was no operational US Navy during his presidency. The US Navy was established in 1794, but had no ships until the first frigate "United States" was completed in 1797, when John Adams had become President.
The Constitution specifies that the President is the Commander-in-Chief of the military. The first US President (George Washington) was thus the first Commander-in-chief of whatever military forces were in place at the time.
The first president, George Washington was commander-in-chief, as are all presidents since this is a constitutional power.
George Washington
George Washington 1st President
Franklin Roosevelt was the first commander in chief of the United States Army when in war with the Imperial Japanese Army.
Post 1947, the President is always the Commander-in-Chief of the Indian army
Commander in Chief .
The Army and the Navy
the president
The President of the USA is the Commander-In-Chief of all the Armed Forces
Theodore Roosevelt
The Commander and Chief of the Continental Army was General (later, President) George Washington.
CommanderThe current US President is the Commander in Chief .