From the Developer's web site:

Prepare For Your Finest Hour
As Lt. Mike Powell, member of the famed 1st Ranger Battalion, you'll battle through over 20 levels based on historical military campaigns of World War II.

Fire period weapons and command authentic war vehicles as you silence the gun batteries at Port Arzew, survive the Omaha Beach landing, and more.

From the contributor:

Medal of Honor Allied Assault was the first in a series of games under this franchise. At the time, it's style and feel were unique and in many ways ground breaking with many similar games coming after it. This is not to say that it was the first or run-away best, but one of the most common compliments seems to be that it was the first to really capture the "right feel". The weapons look, sound and play incredibly true to their real world counterparts and the settings for the missions are beautiful. If you are a fan of the genre, this is a must play.