"exert command" is a correct and usable phrase in written English.
You could use it to express the idea that one person is taking control or having a strong influence over a situation. For example, "The General exerted his command on the battlefield and ensured his army was victorious."
And so, as his performance has spiraled downward, he has focused on areas in which he can exert command.
Morgan will have the first opportunity to exert command over such promising players as Jonathan Bairstow, Yorkshire's batsman-wicketkeeper, the belligerent Durham all-rounder Ben Stokes and James Taylor, the diminutive Leicestershire batsman who is pressing Bopara as the batsman-in-waiting for the Test squad.
It's interesting to hear Bachmann speak of the presidency as a place where you can exert command on commodity prices.
2. Al Zawahri's is not the geriatric bloviating irrelevancy many had made him out to be in recent years -- he still can exert command and control authority over al Qaeda's far-flung regional cells.
If "Spotlight" feels dogged in its procedure, then why does it exert such command?
On December 11th, a court session is scheduled at Fort Belvoir that will address the issue of whether superior officers in the Army and the Marines exerted — or appeared to have exerted — unlawful command influence in persuading the Army to prosecute Hamner.
Can you blame him for trying to exert control over the tiny sliver of his life he still has command over?
"Either you exert control, or we'll exert control.
Exert control over their destiny?
No wonder Crawford exerts such command over audiences young and old, gay and straight.
In the summer of 1991, the performance of the ZNG was poor because it lacked manpower and weapons, and exerted inadequate command and control.
