Section 73. Commanding officers authorized to convene special courts-martial, and commanding officers of regiments, battalions, companies, and equivalent air units, may convene for their commands summary courts-martial to consist of one commissioned officer. Summary courts-martial shall have power to try enlisted personnel for any non-capital offense made punishable by the Uniform Code of Military Justice or by the provisions of this chapter. Personnel above the grade of corporal or similar grade in air units shall not be tried by summary courts-martial if they object thereto before arraignment. Summary courts-martial shall have power to impose a fine not exceeding twenty-five dollars for any single offense and may reduce noncommissioned officers. The proceedings of such court shall be informal and the record thereof shall be substantially the same as that prescribed for the armed forces of the United States.