  Two GEM telescopes, each consisting of three 10x10 cm$^2$ triple-GEM chambers
were built, tested and operated by the Hampton University group. The GEMs are
read out with APV25 frontend chips and FPGA based digitizing electronics
developed by INFN Rome.
  The telescopes were used for the luminosity monitoring system at the OLYMPUS
experiment at DESY in Germany, with positron and electron beams at 2 GeV. The
GEM elements have been recycled to serve in another two applications: Three GEM
elements are used to track beam particles in the MUSE experiment at PSI in
Switzerland. A set of four elements has been configured as a prototype tracker
for phase 1a of the DarkLight experiment at the Low-Energy Recirculator
Facility (LERF) at Jefferson Lab in Newport News, USA, in a first test run in
summer 2016.
  The Hampton group is responsible for the DarkLight phase-I lepton tracker in
preparation. Further efforts are ongoing to optimize the data acquisition speed
for GEM operations in MUSE and DarkLight. An overview of the group's GEM
detector related activities will be given.
