Beckett wants the player character to retrieve a supply of modified Buffout from the Blood Eagles to reduce their chances of recruiting new members after the idea is suggested by Sage during his first visit to the Vault Dweller's C.A.M.P. Go to Dagger's Den, retrieve the Buffout supply from the red steamer trunk in the shack above the brewing station. Watch out for any Blood Eagles that may be at the site and will defend themselves if alerted to enemy presence. Return to Beckett to complete the quest. One of the rewards Beckett will give upon returning is a holotape called The Saga of The Horn, which tells some of the story of how Blood Eagle recruits were tortured. Following this, he decides the time is right to go after the first of the Blood Eagles' triad of leaders, initiating the quest Spilling Blood.
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