How to boost a nuke:
Written for WRC from scratch by Kalantal.

The setup:
1) Put a silencer on your gun and use the Cold Blooded and Ninja perks.
2) Find a partner you can trust.
3) Join a Free For All game and have your partner join in session in progress.
4) You have your partner use a tactical insertion and meet you in a secluded location and kill your partner 25 times, dropping a tactial insertion after each death.
5) Call in that nuke.
6) Then you trade off, or whatever you arranged a head of time.

Choosing a game style.

Free For All: Use the free-for-all game style in most situations. There's less players to come looking for you, and it'll be more difficult for them hunt you down if they're being hunted too.

Team Deathmatch/Team Deathmatch Express: Use these styles if you're also going for the Ultimate Sacrifice challenge. This will be more difficult because the players on your team will see where you are and will come kill your partner if you're found out. After you get your 25 kills just hang back and wait. As soon as the opposing team takes the lead -- drop the nuke.

Tips:
--Once your partner dies 25 times, have him/her dashboard to not take 25 deaths. (Xbox button on your controller, then "Y", then Yes.)
--Preferably use a gun with lots or ammo.
--Remember, you can use a knife if you don't have a weapon with a silencer.
--When running to your spot of choice for boosting, make sure no one sees you on the way, including people on your own team if you're doing a teamed game.
--Make sure you stay low and make sure your other booster stays low.
--Kill your partner as soon as they strike the tactical insertion.. People tend not to like games ending early to boosters, so you can count on as least one person to come wreck your fun. Again: the sooner you have the nuke, the better.


Challenges:

Challenge: "End Game: I" - Call in 2 Nukes.
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Challenge "End Game: II" - Call in 5 Nukes.
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Complete "End Game III" - Call in 10 Tactical Nukes
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Challenge: "Ultimate Sacrifice" - Use a Tactical Nuke while your team is losing.
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AND
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If your partner chooses to stay:
Challenge: "Radiation Sickness" - Get nuked by the enemy. You must be alive at the time the nuke goes off; if you are respawning you will not get the title.
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Good luck!