The submarine pen where the player must destroy a prototype German submarine is an exact replica of the pens in the film "Raiders of the Lost Ark".
In the initial training mission, look in the back of one of the trucks: you will find a box with a number on it. This number is the same as the number found on the box holding the Ark of the Covenant in Los cazadores del arca perdida (1981).
Enemies don't bleed when shot; this is done to get a T rating.
Major Jack Grillo, the SAS operative held prisoner during your first mission and who accompanies you until early in the second, is named for lead sound designer Jack Grillo.
On the 3rd mission Captain Ramsey from the second rangers were heavily influenced by Tom Hanks character from Saving Private Ryan.