Quick Reminder: Halper has had a variety of contracts - it appears to start in 2013 and last one ended March 2018...
When you see multiple contracts year over year w/same agency (like Halper’s history shows) you often to see what is called an Indefinite Delivery Indefinite Quantity (IDIQ) contract.
It is a multi-year agreement that helps streamline the process - I couldn’t find one.