Brilliant, simply brilliant. This source book is fleshed out enough to allow for detailed PC backgrounds to be written. There are enough gaps in the world background to allow your friendly neighborly GM to drop his own slice of the world into the mix with a minimum of conflict.
The few errors I've spotted are quite minor, such as:
1) Using the photograph of a SMLE No. 5 Jungle Carbine as a depiction of a SMLE No. 4 Mk 1 Rifle.
2) Assigning the AK-47 damage stats that exceed the potential damage done by the M1 Garand and the 1903 Springfield.
These mistakes, small in magnitude and number, in no way overshadow the rest of the material.
The only improvements I would make would be:
1) The addition of a timeline from, say, mid-1944 to the background's present day.
2) The addition of German weapons.
If you like pulp, this is for you.