Kriebel is apparently:
KRIEBEL, Paul.
01.10.41 promo to Oblt.
11.42 Oblt., appt Staka 2.(F)/Aufkl.Gr. 125 (to 05.43).
05.43 Oblt., appt Staka 2./SAGr. 125 (to 09.43).
09.43 appt Staka 4./SAGr. 126 (to 09.44).
20.04.45 promo to Hptm.
This is not to be confused with another fellow in the naval-air units:
KRIEBEL, Siegfried.
c. 06.41 Oblt., appt Staka 2./Kü.Fl.Gr. 906 (to 04.42?).
01.02.42 promo to Hptm.
20.04.45 promo to Maj.
We have nothing on Oblt. Schäfer, Oblt. Richter, who apparently never held a command or staff position, or a higher rank.
The others that you mentioned are too low in rank to be in our files.
You could also try the Kracker Archive at:
http://aircrewremembrancesociety.com...erArchive.html
Good luck and good hunting!
HLdZ
DGS