The main purpose of this legislative text is to update the definition of "short-term work" related to the construction of Navy combatant and escort vessels. The objective is to extend the timeframe allowed for certain types of work from 12 months to 18 months. This change aims to improve the efficiency and flexibility of Navy vessel construction projects. The key provision of this legislation is the amendment to the existing law, specifically changing the definition of short-term work in the context of Navy construction projects.