User blog comment:Charles359/Dark Angels Army question/@comment-82.30.168.218-20100911124127

Sounds like a large part of the issue may have been the opponent in question. You basically have the choice of playing your DA straight out of the codex, or playing them according to the SM codex, but for swapping and changing you need the opponent to give their ok. I sympathize, as I'm also DA and the thunderfire cannon and landspeeder storm are very pretty :) With the pieces you have it may be a better idea to alternate which codex you wish to use between games; playing some games with one and some with the other.