In the absence of further context, I would take it to be a description of soldiers who are trained to fight in deserts. Do you have a context that suggests otherwise?
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fairyfan does that mean someone who is being trained in the toughest environment? it doesn't always mean to be trained in the "desert", it is just my guessThat's a good guess (I was thinking that myself), but I don't think it's right. I think that there has to be an actual desert involved somehow. The writers do seem to be taking the term a bit figuratively,
fairyfanWhat does tongue-in-cheek mean?jocular, facetious, not meant seriously