Get Your Friends Together
If you want to, you can play through The Division on your own, but it’s quite apparent from the numerous gameplay trailers and from playing through the Beta that the game is at its best when you’re with friends. Not only will completing missions and entering the Dark Zone be more entertaining, but the rewards for completing tasks and capturing and upgrading bases will be shared equally when you’re with friends.
For example, if one person in your team captures a base and upgrades it, everyone who’s with them at the time also will now have unlocked the base with that particular upgrade. Besides, you probably won’t want to go into the Dark Zone on your own.