Here are some good sites for finding all kinds of maps including thematic and topical one.

Unified Combatant Commands

Map of Unified Combatant Commands(source)

Special Forces Operations 2001-2002

Map of Special Forces 2001-2002(source)

Locating Maps

Here are some great pages that will help you locate maps including: country, military, thematic and topical.

Afghanistan - Operation Anaconda

Map of Afghanistan Operation Anaconda


Operation Iraqi Freedom

Map of Operation Iraqi Freedom(source)