Ash plume from Mount Redoubt, Alaska

Anchorage, Alaska

Satellite view of Mayon Volcano emitting a thin volcanic plume.

Snow in south central Alaska.

The Yukon Delta in southwest Alaska.

Satellite image of the Greek island of Rhodes in the Aegean Sea.

Anti-aircraft guns mounted on an M109 chassis to simulate a Soviet ZSU-23-4.

The Mackenzie River empties into Mackenzie Bay in Northern Canada.

Cloud streets over the Bering Sea.

Plume from Okmok Volcano, Aleutian Islands

Plumes from Okmok Volcano, Aleutian Islands

Soldier engages targets downrange on the M2. 50 caliber machine gun.

Aerial image of Mount St Augustine Volcano, Cook Inlet, Alaska.

Aerial view of glaciated Shishaldin Volcano, Unimak Island, Alaska.

Aerial image of Mount St Augustine Volcano, Cook Inlet, Alaska.

Aerial view of Shishaldin Volcano, with Isanotski Peaks in foreground, Alaska.

Aerial view of frozen lake in summit crater Mount Douglas volcano, Alaskan Peninsula.

Satellite view of Mount McKinley, Alaska.