Section 21
SEC. 21. The organization of the Regular Force shall be as follows: The Constabulary shall be organized from such personnel of the Regular Force and in such manner as the Chief of Staff may prescribe. In to addition to the normal peace-time duties now prescribed, the Constabulary shall be charged with the execution of laws pertaining to the discharge of their military obligations by male citizens of the Philippines, and with the supervision of such preparatory military instruction as the Chief of Staff may prescribe. All other regular units shall be organized as the President may direct. The President may attach to regular units or may assign to duty with any component of the Regular Force such number of reserve officers as he may deem necessary. All periods of such duty as do not exceed 21 days annually shall be considered as regular annual training; all periods m excess of 21 days annually shall be classed as extended tours of active duty. The President may likewise attach for their prescribed period of military training such number of trainees to regular units as he deems necessary.