Abstract: Recently, after nearly a whole year of data taking, four highly rated tritium experiments, including two Argonne-led experiments, have been concluded successfully in Hall A at Jefferson Lab. The tritium program used the tritium and helium-3 minor nuclei as sensitive model-independent probes to study the d/u ratio at high-x, explore the neutron’s internal structure, as well as investigate the nucleon-nucleon interactions in three-body systems. The Argonne Medium Energy Physics group played a leading role in preparing and running the entire program. In particular, Roy Holt’s original design of the tritium target system made the running of the program possible. In this talk, I will introduce the physics motivation of the program, share the details of carrying out these experiments, discuss the current status of the data analysis, and review prospects for future experiments.