Calley was charged with four specifications alleging premeditated murder in violation of Article 118 of Uniform Code of Military Justice:
Art. 118. Murder
Any person subject to this chapter who without justification or excuse, unlawfully kills a human being when he-- 1) has a premeditated design to kill; 2) intends to kill or inflict great bodily harm; 3) is engaged in an act which is inherently dangerous to others and evinces a wanton disregard of human life; or 4) is engaged in perpetration or attempted perpetration of burglary, sodomy, rape, robbery, or aggravated arson; is guilty of murder, and shall suffer such punishment as a court-martial trial may direct.
The specifications:
Specification 1: In that First Lieutenant William L. Calley, Jr. ...did, at My Lai 4, Quang Ngai Province, Republic of South Viet-Nam, on or about 16 March 1968, with premeditation, murder an unknown number, not less than thirty, Oriental human beings, males and females of various ages, whose names are unknown, occupants of the village of My Lai 4, by means of shooting them with a rifle.
Specification 2: In that First Lieutenant William L. Calley, Jr...did, at My Lai 4, Quang Ngai Province, Republic of South Viet-Nam, on or about 16 March 1968, with premeditation, murder an unknown number, not less than seventy, Oriental human beings, males and females of various ages, whose names are unknown, occupants of the village of My Lai 4, by means of shooting them with a rifle.
Specification 3: In that First Lieutenant William L. Calley, Jr...did, at My Lai 4, Quang Ngai Province, Republic of South Viet-Nam, on or about 16 March 1968, with premeditation, murder one Oriental male human being, whose name and age is unknown, by shooting him with a rifle.
Specification 4: In that First Lieutenant William L. Calley, Jr...did, at My Lai 4, Quang Ngai Province, Republic of South Viet-Nam, on or about 16 March 1968, with premeditation, murder one Oriental human being, an occupant of the village of My Lai 4, approximately two years old, by shooting him with a rifle.