Prided itself on being a crack unit.

Give him another two months, and he would whip them into a crack fighting unit.

While you definitely have your allotment of criminals, I fear you're lacking the offsetting crack fighting unit to serve as an example.

It was immediately obvious that they were a crack unit.

Moreover, the 617 was a crack unit of veteran crews.

These formations soon became the crack units of the White Army.

It had been a long, hot day for the crack unit.

"They probably hired a crack unit," I said.

It is now plain that Iraq used its conscripts as fodder in the 100-hour war, and pulled back crack armored units for use against rebels.

The service provided by this crack unit suggested how effective communications could be in the hands of experienced troops.