The phrase "are at the command" is correct and usable in written English.
It can be used to indicate that someone has control or authority over something or someone else.
Example: "The officers are at the command of the operation, ensuring everything runs smoothly."
Alternatives: "are in charge" or "have control over".
My services are at the command of the party, and I feel a relief now that the burden of leadership is transferred to other shoulders.
He had also just eaten an army chicken curry in the huge all-ranks mess tent which serves the 1,200 troops - a third of them women - who are at the command and control HQ of Operation Saif Sareea, in which 20,000 British service personnel are engaged.
Robin Wauters, Leena Rao, and I are at the command station.
Once you are at the command prompt, you will need to start the System Restore program.
"Where are you?" "I'm at the command post also," the Taliban soldier said.
All means of knowledge and information would be at its command; just as they would be at the command of the legislature which created it.
After Thursday's failure, Peter Diamandis, the foundation's executive chairman who was at the command center, said SpaceIL would still receive the $1 million.
But officials who were at the command said he had less reason to scout sites at the time because he was finishing a two-year tour as an assault team leader.
"Oh, thank God, thank God, this is the greatest day of my life," said Rita Bargetto-Snider, who was at the command post where the rescue was being coordinated when she received word that her brother, Paul, was apparently safe.
Others will be at the command and control center inside 1 Police Plaza, the City Office of Emergency Management's so-called bunker on the 23rd floor of 7 World Trade Center and a temporary Navy center on Pier 94 on the Hudson River.
