Half the Time: An Overview of the LBO-USNO Timeshare Agreement

We present an overview of the Long Baseline Observatory (LBO) -- United States Naval Observatory (USNO) 50% timeshare agreement. The USNO has contributed 50% of the operations costs to the LBO in exchange for 50% of the time on the VLBA since January 2017. The USNO uses the majority of this time allotment for observations related to Celestial and Terrestrial Reference Frame work and Earth Orientation Parameters, including maintenance and improvements in preparation for the upcoming release of the ICRF3, source structure studies, and daily Intensive and geodetic observations. In addition, USNO supports scientific research observations related to our mission objectives. Here, we present a summary of our supported projects on the VLBA and our thoughts and ideas for potential future applications of the VLBA.