Cooper to Liz about Seaduke. 

L- You wanted to see me?
 
C- I know it's hard to believe, but I was a golden boy once.
  Fresh out of the Navy. Youngest agent ever appointed to the Pentagon's
  combined investigation and intelligence task force.
  At the time, Reddington was stationed overseas working counterintelligence.  

 L- You worked together.
 
C- He was shadowing a Russian operative code-named Seaduke. 

 L-  So that's why he surrendered to you.
 
C- Seaduke made Reddington and dispatched a team of Spetsnaz to abduct him.
  For 10 days, they tortured him, until he was rescued by an FBI-SEAL Joint Task Force.
  I was working lead on the agency side. My job was to secure the physical evidence
  in the event that Seaduke was captured and prosecuted. 

 L-  I'm sorry, um why are you telling me this?
 
C- Because I meant what I said.
  I'm angry that you still don't know why Reddington walked into your life.
  The blood on this shirt from Raymond Reddington has been sealed in an evidence locker
  for over three decades. I procured a sample and submitted it for a DNA profile.
  Yours was already on file. 

 L- Procured a sample of Reddington's blood?
  From evidence? That's tampering.
 
C- Yes. And I should've done it the day he surrendered.
  I submitted the sample and your profile to a private lab.
  They'll have the results within 24 hours, so you'll finally know whether or not
 Raymond Reddington is your father.