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It is interesting that your father flew SAC B-47's - I would think that they were rather a difficult aircraft to fly! I remember seeing SAC B-47's at several UK bases in the 1950/60s and remember them taking off (just!) from RAF Brize Norton without the aid of JATO. Much noise and smoke!
Regarding the specific unit of my B-50 image - I must rely on your expert information. I know it is a 15 AF aircraft - but the rest is not so certain. So - please upload your chosen image in place of mine. No problem at all. Accuracy is a must!