Section 33. Retired officers and non-commissioned officers shall be placed on the retired list by the commander-in-chief, by regulations promulgated by the commander-in-chief, and on occasions of ceremony may, and when acting under orders as hereinafter provided shall wear the uniform of their retired grade. They shall be eligible to perform any military duty to the same extent as if not retired, and the commander-in-chief may require them to serve upon military boards, courts of inquiry and courts-martial, or to perform any other duty, and while actively engaged in such duty they shall receive the pay and allowances under the provisions of subsection (a) of section eighty-three. They shall be amenable to court-martial for military offenses.