Should I vaccinate for Mareks?

[ms riss]

Ok- kind of a newbie here. I have 5 laying hens and a roo. I also have 25 chicks that I intend to raise as meat birds. The latter are freedom rangers, the chicks are now 4 days old. I hope to get this chicks outside in a run in about 3-4 weeks where they will be in proximity with my other chickens. I know that four of my five chickens are vaccinated. Not sure about the roo or my oldest RIR. Should I worry about all the birds and just vaccinate all of them? Should meat birds be vaccinated? Don't want to hurt my layers.

Thanks for the help