Recon Armor (Fallout 3)

Recon Armor can be acquired in Fallout 3 after you complete the Finding the Garden of Eden quest.

After completing "Finding the Garden of Eden", you will head to the Citadel. Follow the objective marker until you meet up with The Lyons' Pride. You will go into a HUD-less cinematic. During this cinematic, you will be asked about the G.E.C.K. When the conversations are over, you will speak to Sarah Lyons. She will offer you training in Power Armor or Recon Armor.