Most of the aircraft reached England a few days before the ground units arrived.

The ground units were to advance upon Boston and fire into the city.

Weather conditions can also affect vision and movement of ground units.

"Get ground units started down the river on both sides."

Aviation also supports ground units of the state and local police.

Moving the United Americans various ground units had taken longer.

This offered the flexibility required to support the ground units.

He cursed his ground units for not being in position already.

That's too few people to put in a ground unit to check.

"We have the ground units on a different line," Franks said.