I think he's a medical officer. If you closely at the photograph with his son, his shoulder board device appears to be an Aesculapius Rod. None is visible in his BW portrait, but medical officers of the Bundeswehr (physicians, dentists, pharmacists and veterinarians) initially wore their trade badges as cloth patches on both lower sleeves of the tunic. (At least into the 1970s; I don't know when exactly the metal shoulder board devices were adopted.)
The Waffenfarbe for the medical service was dark blue both in the Wehrmacht and the Bundeswehr, which also fits the dark color seen in these photos.
I'd say, HPL2008 is spot-on, he probably was a medic.
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