Ranks and medals (Resident Evil 6)

In the campaign only 4 grades: A, B, C, D (A, B, C, d in the Russian version). About the people don't know.

Why only 4 ? If at the end of Chapter assessment for all will stand 5, it will give rank's

The ranks of the Mercenaries
[ E] Solo: 0-39,000 | Koop: 0-59,999
[ D] Solo: 40,000-59,999 | Koop: 60,000-Than 89.999
[ C] Solo: 60,000-79,999 | Koop: 90,000-119,999
[ B] Solo: 80,000-99,999 | Koop: 120,000-179,999
[ A] Solo: 100,000-139,999 | Koop: 180,000-219,999
[ S ] - Solo: 140,000+ | Koop: 220,000+

Ne3lobin
Yes? Didn't know that. Well, then I apologize for the misinformation.

I think the letters mean rahmatali.
Spoilerage, gold
Bronze, bronze
Cuprum, copper
Silver, silver.
I have not played the first 3 parts. Perhaps the answers lie there