The Life-Model Decoy Program was a dismissed S.H.I.E.L.D. project set up to create a Life-Model Decoy, an android designed to act as a safeguard substitute for a S.H.I.E.L.D. agent. The project was eventually picked up and completed by Holden Radcliffe.
The Original Program
S.H.I.E.L.D. technicians Eric, Billy and Sam Koenig worked together on the original LMD Program. However, despite the efforts, they never achieved to built a fully functional android. Eventually, the project was abandoned.
The Life-Model Decoy Program was secretly reactivated years later by Dr. Holden Radcliffe, who was cooperating with S.H.I.E.L.D. and had befriended S.H.I.E.L.D. scientist Leo Fitz. Using the LMD program's technology, Radcliffe successfully transferred the data of his personal digital assistant A.I.D.A. into an android body. Radcliffe never disclosed Aida's true nature to anyone but Fitz until he was forced to admit that he had worked on the LMD program without S.H.I.E.L.D. proper authorization.
More and More Androids
Under the corrupting influence of the Darkhold, Holden Radcliffe and Aida successfully built many LMDs. These notably included androids of Melinda May, Phil Coulson, Leo Fitz, Jeffrey Mace, Alphonso Mackenzie as well as several LMDs of Daisy Johnson and a LMD of Radcliffe himself. Unlike Aida, who was running on extremely sophisticated computer programs, these LMDs were functioning with Quantum Brains.