I've spotted a little error and fixed it.....
From Buenos Aires they caught a JU-52 to Puerto Santa Cruz, where they met up with the new SS security force, and a handful of scientists and officers returning after a month’s leave.
“You won’t believe the cold,” one of the archaeologists told John with a shiver.
“Will this thing take us far enough?” David asked with rising concern.
“Only just,” a young officer told him. “The compound is at the limit of the Junkers’ range. Once it arrives it has to refuel and take off immediately, otherwise its engines would cool down too much and freeze solid.”
A young officer lowered his checklist, turned to him and said, "Sadly no, unless you have a tail wind of Biblical proportions your JU-52 will run out of fuel some 750km short of the Antarctican Continent. Even if you flew from the Tierra del Fuego you would all perish."
"You jest surely?"
"No, really, the JU-52 has almost no range at all. You should be using the FW200 Condor."
This came as something of a shock to David. He took a few moments to collect his thoughts as the youngster grinned at him. Slowly he said, "You know the maximum range of the JU-52?"
"Of course, we are the Luftwaffe. We are experts."
"You know the distances. . . the geography?" Said David.
"You think we are imbeciles, we know how to read maps."
"Yet you are sending us to our deaths?"
"Of course." The officer snapped his heels together. "We are ####'s. We know how to follow orders."
“That’s nice to know,” David said, sarcasm dripping from every word.
* * *
This is tongue in cheek - wasn't going to mention JU-52 but you referenced it directly and I couldn't help myself.
I'm really liking the implied back story of your characters - the missions and events in their pasts, nicely done, looking forward to your next segment.