The Biden administration’s Dec. 8 deadline for COVID-19 immunizations may cause a loss of ‘several thousand' employees for U.S. aerospace and defense firm Raytheon Technologies, according to its top boss on Tuesday. Last month, the maker of Tomahawk missiles said it will require all 125,000 U.S. employees to be fully vaccinated, after the Biden administration mandated immunization for nearly all federal employees and contractors to widen vaccination coverage in the country. Many other federal contractors have followed suit with vaccination mandates including Boeing, 3M and American Airlines. European planemaker Airbus, which supplies helicopters to the U.S. Army joined that list on Tuesday. Not every company has received pushback from its employees though… United Food and Commercial Workers, the union which represents 26,000 workers at Tyson Foods, said on Tuesday over 96% of employees were now vaccinated. Meanwhile, U.S. retailer Walmart, who has yet to issue broad requirements, will soon be required to do so by the Labor Department. Separately, Raytheon chief executive Greg Hayes said he expects Biden's vaccine mandate to cause "some disruption" in the supply chain in a post-earnings conference call.