The field ovens M59 have been kicking around since WW II but they are capable of some pretty good results in the hands of mess sergeants who know how to operate them safely. The heart of the oven is the gasoline burner unit M2 NSN 7310-00-842-9247 and there have been some improvements over the years. There is even a version with a safety device but it's still caught out many an unwary KP attempting to light the bastard with a bang and a WOOOSH as it tries to burn the world down around his ears, (much to my amusement). The immersion heaters are good for a laugh too what with their drip feed carburetors.
Look at that fooker with the tab in his lip about to ladle some disgusting thing out of that pot. Mystery meat stew no doubt.
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Has nobody considered that cooking a meal whilst smoking was detrimental to the health and safety of those at Khe San?