I've heard that too and God only knows what kind of crud they sucked up because of burning oil wells and other chemicals they may have been exposed to. Chemical warfare isn't like the old days when you could see the yellow cloud and feel the burning.
Here are at least some links to Gulf war ALS articles in the MDA magazines. I hope through this forum and other forums you can meet some other Gulf War vets. LAst article also has info on the Vets registry--you can join in and help solve this mystery by taking part in the veterans study...my husband is in it (he was in Air Force in 1980s).