Translation Help

[Auke]

1. Otd. stands for otdel (section / department), so I'd say it reads "Chief of the department for combat readiness and personnel of an aviation regiment".
2. I think "pod-ki" stands for podgotovki (podgotovka, preparation) and "l-tov" for leitenantov (leitenanty, Lieutenants), so it is probably a Lieutenants training course.
3. 21st Long Range Bomber Regiment, 50th Aviation Division. I'm not sure about the first word on the next line, but it ends with "commander of (or in) the Odessa Military District".
4. 21st, redesignated as 24th Guards, and later renamed to 240th Guards Long Range Bomber Regiment.
That's this regiment:
21 ���� -> 21 �� �� -> 24 ��� �� -> 240 ����

Hope this helps.

Auke