The strain of operations was already showing and commander Simpson ordered Wanklyn to be taken off patrols. Simpson could not spare his crew and they were not afforded the same respite. Wanklyn was now the leading Allied ace and Simpson was anxious to rest him. While off combat duty, Wanklyn lectured and tutored new officers if he was asked, but preferred not to force junior commanders to listen to his experiences. Simpson did not want to expose "Upholder" to undue risk in his absence, and the submarine was allotted the Messina to Tripoli route, rather than allowing it to conduct operations close to the enemy shore. In Wanklyn's absence, a new 27-year-old commander, Arthur Hezlet, took over from him. Hezlet was an aggressive commander and Simpson made sure to send the vessel somewhere he could not get the crew into trouble, so that they would be returned to Wanklyn intact. Only a German hospital ship came across his path during the single June 1941 patrol, and he was forced to let it go.