To me Search and Destroy is the most fun and fastest way to rank up. In Search and Destroy, one of the best attachments to have is a Silencer, sometimes people prefer the Red Dot sight, but when your the only one left alive in you team, having a silencer is good.
Special Grenades
Special Grenades play a cruical part in the game. While you defending, Smoke Grenades are very useful, they give you a chance to aviod Snipers and get to position, or to escape/trick an attacker.
When attacking, using a Stun or Flash Grenade is important to aviod getting killed or seen. Throwing a Flash is more effictive since it blinds your opponent longer that a stun, this gives you an advantage over the opposing team. Use each Special Grenade Wisely.
Weapons
Picking the right weapon is essential in Seach and Destroy. You need to know which Weapon you are good with and which weapon would give you thw upper hand against any opponent.
In any case, I prefer the P90 with the silencer, it kills in less than 10 shots, has a HUGE magazine which lowers the times of reload to 1 or maybe even 0, amazing accuracy and it looks cool

. Ak-47 a powerful gun with amazing accuracy, 3 to 5 shots to kill. MP5, this with faster reload is ownage, amazing gun. For a Sniper I would use the M40 with an ACOG Scope. Sometimes trying new guns does not hurt, use a gun you think your good with.
Perks
Each perk play an important role in the outcome of the game and how you use the perk is also important.
For Perk 1, the defender should Pick from:
1. C4 - This is probably the most useful perk for a defender. Why? Because throwing this under the bomb or near the bomb makes it less visable and more effective than a claymore ( Which ticks giving the opponent time to back off and get hurt by a little bit ). Once you hear that the bomb has been planted, double tao Sqaure and you killed the planter ( Which may be the only one left.
2. Frag x 3 - This helps you spam the opponent with Frags, which is really helpful, throwing one random 1, one in a hiding spot and one towards an opponent you just saw.
3. RPG x 2 / Grenade Launcher - Big Boom = Kill.
Attackers:
1. Special Grenades x 3 - Flash or Stun and you could kill 3 opponents with no problem using those tacticts.
2. RPG x 2 / Grenade Launcher - Big Boom = Kill.
3. Frag x 3 - This helps you spam the opponent with Frags, which is really helpful, throwing one random 1, one in a hiding spot and one towards an opponent you just saw.
4. Bomb Squad - Not as useful as CoD5 since Claymores are easily avioded. May be helpful if you cant track claymores good enough.
Perk 2 - Well this perk should obviously be Increased Health. Why? Because it takes 2 Sniper Shots to kill you, it gives you an upper hand against someone with the same weapon in Face to Face Combat.
Perk 3 - Last stand, i dont use it, i dont see it as that helpful, but you can go for it. The only 3 you should pick are:
1. Steady Aim - Easy No-Scopes, Crosshair aiming and faster killing.
2. Xtreme Conditioning - Get to position Faster
3. Deep Impact - Shooting through walls IS effective.
Classes
There are some Classes I find Useful:
P90 + Silencer
Flash
Special Grenades x 3
Juggernaut
Steady Aim
MP5 + Silencer
Smoke
C4
Sleight of hand
Steady Aim
AK-47 + Silencer
Flash
Frag x 3
Juggernaut
Deep Imapct
M4 Carbine + Red Dot
Stun
Special Grenades x 3
Stopping Power
Extreme Conditioning
M40 + ACOG
Smoke
C4
Stopping Power
Steady Aim
- More Info will be added -
PLEASE + Rep and thank
Thank you!