Can People Only Joing Spartan Companies on Forums?

Can you invite people to your spartan company in game or does it have to be through the forums or can they accept an invite in the game sent through the website?

From what I know, you can only join Spartan Companies VIA halowaypoint.

damn i wish it was like halo 2 where you could invite and accept through the game.

This belongs in the Spartan Companies forum on Waypoint. Just saying.

maybe a mod can move it