Halo social infection games

[c[__]]

which game mode are these under as im only missing these medals for the set?

[GearsOfWar]

I done a quick Google search and it said that it can only be done on The Living Dead double exp weekends, so it could be like weeks before you could get them medals because Bungie always put crap double exp things up.

[c[__]]

oh, looks like ill be waiting ages
what about ranked ones?

[Coheed&Cambria]

It's either team swat double xp, or living dead next week.