Raytheon Network Centric Systems, 365 NLRB No. 161 (Dec. 15, 2017) (“Raytheon”), is one of several decisions issued this month by the National Labor Relations Board’s (the “Board”) new Republican majority which reverse Obama-era precedent. Raytheon overrules the Board’s decision E.I. du Pont de Nemours, 364 NLRB No. 113 (2016) (“DuPont”), which limited the changes employers can make unilaterally in a union environment. Raytheon clarifies the degree to which employers may rely on past practice to make unilateral changes to terms of employment once a collective bargaining agreement has expired, and, more specifically, offers welcome guidance to employers with regard to continuation of health benefits under those circumstances.