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The synth requisition officer is a generation 2 synth merchant living in the Institute in Fallout 4. It is located under the green shopping bag sign on the bottom floor, right off the main elevator (corridor between Robotics and Bioscience).
The synth requisition officer only carries fusion cells and plasma cartridges for ammo, in above-average amounts. No other types of ammo are sold by this vendor. This is probably due to the Institute's reliance on energy based weapons in the field