However, it was assumed that ships as large as Indianapolis would reach their destinations on time, unless reported otherwise. Therefore, their positions were based on predictions and not on reports. On 31 July, when she should have arrived at Leyte, Indianapolis was removed from the board in the headquarters of Commander Marianas. She was also recorded as having arrived at Leyte by the headquarters of Commander Philippine Sea Frontier. Lieutenant Stuart B. Gibson, the operations officer under the Port Director, Tacloban, was the officer responsible for tracking the movements of Indianapolis. The vessel's failure to arrive on schedule was known at once to Gibson, who failed to investigate the matter and made no immediate report of the fact to his superiors. Gibson received a letter of reprimand in connection with the incident. The acting commander and operations officer of the Philippine Sea Frontier also received reprimands, while Gibson's immediate superior received a letter of admonition (a less severe military punishment than a reprimand). In the first official statement, the Navy said that distress calls "were keyed by radio operators and possibly were actually transmitted" but that "no evidence has been developed that any distress message from the ship was received by any ship, aircraft or shore station". Declassified records later showed that three stations received the signals but none acted upon the call. One commander was drunk, another had ordered his men not to disturb him, and a third thought it was a Japanese trap. Immediately prior to the attack, the seas had been moderate, the visibility fluctuating but poor in general, and Indianapolis had been steaming at . When the ship failed to reach Leyte on 31 July, as scheduled, no report was made that she was overdue. The Navy then created the Movement Report System to prevent such disasters in the future. Court-martial of Captain McVay Captain Charles B. McVay III, who had commanded Indianapolis since November 1944 through several battles, survived the sinking, though he was one of the last to abandon ship, and was among those rescued days later. In November 1945, he was court-martialed on two charges: failing to order his men to abandon ship and hazarding the ship. Cleared of the charge of failing to order abandon ship, McVay was convicted of "hazarding his ship by failing to zigzag". Several aspects of the court-martial were controversial. There was evidence that the Navy itself had