I know there are certain missions you can only do with 2 people, but are the others also 2 player missions?

What? Ya all Spec Ops can be done with 2 players. 

Yea, it's joint ops bro.

They can all be done with 2 players.

Joint Ops, check
and with 2 players, check
Double check
2x2 is 4
Thanks for the info

I think a lot of the mission are easier by myself,  but that's just me. 
 
 
There are also mission easier with two people. They can all be played with two people though.

Wait, so you can do all the campaign missions with two people, and all the Spec Ops with two people?