What is one problem that rocket scientist dr. awkward never had?

Rocket scientists work in NASA, or space agencies.  They are also there to help develop new rocket powered by weapons for military use. 

This question about Dr. Awkward is a riddle, and the one problem he never has spelling his name backwards. Even he spells his name backwards, it still is the same.

1) d

2)c

3)b

4) a

5)c

6) c