DS/DD?

[Tachypsychia]

I see DS and DD used a lot on the forums. I know there's a simple answer but my google skills fail. What do they mean regarding candidates?

 

[kp2001]

Dear Son or Dear Daughter

Here's a fairly comprehensive list that people have put together on this forum:

http://www.serviceacademyforums.com/showthread.php?t=11568