House Armed Services Committee (HASC) Chairman Mac Thornberry (R-TX) introduced the Acquisition Agility Act, H.R. 4741, on March 15, 2016. The bill would restructure the core acquisition system and introduce the concept of modular and open-system architectures (MOSA) as the basis for all major defense acquisition programs beginning in 2018. The Committee “believes that open systems create opportunities for incremental improvements and insertion of new technologies” throughout the life of a weapons system. MOSA weapons would include well-defined interfaces to simplify upgrades and reduce sustainment costs. The bill would also give the military services flexibility to experiment with prototypes and rapidly deploy new components.