2123. Small unmanned aircraft safety standards. Sec. 2124. Small unmanned aircraft in the Arctic. Sec. 2125. Special authority for certain unmanned aircraft systems. Sec. 2126. Additional rulemaking authority. Sec. 2127. Governmental unmanned aircraft systems. Sec. 2128. Special rules for model aircraft. Sec. 2129. Authority. Sec. 2130. Unmanned aircraft systems aeronautical knowledge and safety. Sec. 2131. Treatment of unmanned aircraft operating underground. Sec. 2132. Enforcement. Sec. 2133. Airport safety and airspace hazard mitigation and enforcement. Sec. 2134. Aviation emergency safety public services disruption. Sec. 2135. Public UAS operations by tribal governments. Sec. 2136. Carriage of property by small unmanned aircraft systems for compensation or hire. Sec. 2137. Collegiate training initiative program for unmanned aircraft systems. Sec. 2138. Incorporation of Federal Aviation Administration occupations relating to unmanned aircraft into veterans employment programs of the administration. Sec. 2139. Report on UAS and chemical aerial application. Sec. 2140. Part 107 implementation improvements. Sec. 2141. Redesignation. PART III—Other matters Sec. 2151. Federal and local authorities. Sec. 2152. Spectrum. Sec. 2153. Use of unmanned aircraft systems at institutions of higher education. Sec. 2154. Transition language. PART IV—Operator safety Sec. 2161. Short title. Sec. 2162. Findings