Use the following strategies when playing online. 

When playing recon, do not be a selfish sniper. Stay relatively close to the 
objective. You will get more kills and your squad will not feel the urge to 
kill you as often. When a vehicle or person is tagged by a tracer round, demo 
classes will be able to home their rockets in on the target. Do not be so 
determined to get someone's dog tags that you forget about endangering yourself
or your objective. Snipers move; it makes it harder for a counter-sniper to draw 
a bead. Never get into a helicopter without a partner.