All of the RvB Easter eggs

Games Other Halo
1

Has anyone found all the red vs blue easter eggs? The achievement says easter eggS. Are they in the campaign or just in spartan ops? Thanks.

2

One in each SOps Chapters. The first two are both in the last mission of each

3

I have found two. One in each of the chapter 5s in each episode. It triggers some funny dialogue.

4

I found the first one, does that me there is none in the campaign?