Microsoft CEO Satya Nadella defended a $480 million contract to outfit the U.S. Army with 100,000 HoloLens headsets that has drawn opposition from a group of employees who don’t want to see the technology weaponized.

“We made a principled decision that we’re not going to withhold technology from institutions that we have elected in democracies to protect the freedoms we enjoy,” Nadella said in an interview with CNN at the Mobile World Congress event in Barcelona, where Microsoft yesterday introduced a second-generation HoloLens “mixed reality” headset.

Late last week, a group of employees issued an open letter to Nadella and Microsoft President and Chief Legal Officer Brad Smith, calling on the company to drop the contract. The group says it represents “a global coalition of Microsoft workers” who don’t want to see the teams that built HoloLens become “implicated as war profiteers.” The group wrote that the company needs to do a better job informing engineers about what their work will be used for.