A group of sergeants, similar to how a number of cows make up a heard, or a number of ravens make up a murder, or a number of birds make up a flock, a number of sergeants make up a bother.
The commander was giving a briefing on the upcoming exercise to a bother of sergeants.
A group of analysts similar to a group of cows being called a herd, or a group of monkeys being called a troop. A group of analysts is called a query.
In the room their was a query of dedicated analysts working on the report.