Patrol boats are used for patrols of coastal areas, lakes and large rivers.

They were used for convoy escort duties and anti-submarine patrols.

Used for patrols in the Dutch home waters.

These aircraft were used for both training and anti-submarine patrols.

Vehicles that are in poor repair, they say, will not be used for patrols, but put at checkpoints.

After this, the ship was used for escort duties and patrols.

During the war it was used primarily as a transport airfield and for antisubmarine patrols.

Till 1942 they were also used for anti-submarine patrols over the Black Sea.

But many are involved in logistical and other duties and cannot be used for patrols.

During the summer months, motorcycles are used for patrols when weather permits.