The FCC is requesting comment on a proposal to relocate secondary non-federal radiolocation services and amateur users in the 3.3-3.55 GHz band to make the spectrum available for advanced commercial services, including 5G. The MOBILE NOW Act, passed by Congress last year, requires the FCC to work with the National Telecommunications and Information Administration to evaluate whether commercial wireless services and federal incumbents could share use of mid-band spectrum between 3.1 and 3.55 GHz. The FCC’s Notice of Proposed Rulemaking is an initial step toward potential future shared use of this spectrum between federal operations and flexible use commercial services. The FCC seeks comment on relocation options and transition mechanisms for these incumbent non-federal users.