Ginge said:

Hairy, I'm with you in that I hate "close the blast doors". Like you, I thought it was a SE addition when I first heard it in 1997. No other stormtrooper in any of the three films sounds like that guy! It sounds like it was added later on to give a reason as to why the doors close. I hate it, I know others that hate it and if you do an alternate mix, I really hope it's not included because I wouldn't be able to listen to it.

Just as an opposing viewpoint, in 1977 I heard it in the theaters 3 times, and the subsequent "open the blast doors" never failed to get a laugh from the audience as a result. When I bought my first VHS tape of SW in the early 1990s I was furious that the line wasn't included. I thought it was a later decision to remove it! In any case, it most definitely was not an SE edition. In fact, since it was on the mono mix, it's probably fair to say that more people heard the line in 1977, than not.