Aldrin with assembled seismic experiment. He has just deployed the Early Apollo Scientific Experiments Package (EASEP). In the foreground is the Passive Seismic Experiment Package (PSEP); beyond it is the Laser Ranging RetroReflector (LRRR); in the center background is the United States flag; in the left background is the black and white lunar surface television camera; in the far right background is the Lunar Module. Jul 20 1969.