The phrase "a major command" is correct and usable in written English.
It can be used in a military context to refer to a significant organizational unit or command structure within armed forces.
Example: "The General announced that a major command would be deployed to the region to enhance security operations."
Alternatives: "a primary command" or "a key command".
A retired four-star general, who ran a major command, said, "The system is starting to sense the end of the road, and they don't want to be condemned by history.
While large headquarters have been combined and realigned over the years, Pentagon officials could not recall a time when a major command was shut down and vanished off the books, even though some jobs will probably be added elsewhere to carry on essential parts of the mission.
Lafayette pushed for an invasion of Britain, with himself to have a major command in the French forces.
Since then, it has served as a major command and logistics hub for U.S. regional operations, including the wars in Iraq and Afghanistan. .
Historians have noted that Howe's inability to take the British fortifications damaged his career and that he was never again given a major command.
Vendôme formally took over command in Flanders on 4 August; Villeroi would never again receive a major command – "I cannot foresee a happy day in my life save only that of my death".
He finished the war a major, commanding No. 6 (Training) Squadron in England.
McNulty has found peace working as a patrolman and living with Beadie Russell, and refuses promotions from Daniels, now a major commanding the Western District.
It is as if, he writes, "an acting major commanding a small force of guerrillas behind enemy lines had direct access to Eisenhower whenever he pleased in the second half of 1944".
It was not until 1943 that he was given his next major command, again as commander in chief in India.
He had not been given a major sea command, and his physical condition had deteriorated, causing him to fail the flight physical required for any carrier command position (in addition to his limited arm movement, certain weather would always cause him to walk with a limp).
