ONCE YOU GET TO THE WATER TOWER, PICK
UP THE RIFLE AFTER YOU KILL THE GUARD,
THEN USE YOUR BINOCULARS AND SITE IN 
ON CAMERAS AND SHOOT THEM OUT. THEN 
SITE IN AND KILL AS MANY GUARDS AS 
POSSIABLE. ESPECIALLY THE GUARDS IN THE
OTHER WATCH TOWER AND IN THE GATE HOUSE 
BELOW THE TOWER. THEN PROCEED TO THE 
OTHER TOWER AND FINISH OFF THE REST OF 
THE GUARDS. THIS SHOULD MAKE IT VERY 
EASY TO FINISH THE REST OF THIS LEVEL.