Or they are capable of learning how. Lincoln had none, except a short time in the Black Hawk War. But he seems to have enjoyed it. He was not a hunter, but a good shot and good horseman. At times, after his generals failed him, he thought of taking to the field him ,as no President since George Washington had. One reason he liked Grant was because Grant took the fight to the enemy. One reason why he brought Grant to Washington and made him Lieutenant-general—that is the right arm of the President was that he had carefully studied how to take Vicksburg. He even had a plan in mind, which he revealed in a letter to Grant. When Grant sprung the surprise that trapped the Confederates, he also surprised Lincoln, who admiringly conceded to Grant that he was wrong and Grant was right. He knew then he had a commander like Robert E..Lee to match Lee.
Lincoln may not have had a strong military background, but he still ran things. He had a few businesses under his belt before becoming President. Just like Reagan. Reagan spent almost his entire non-political career running things, from his own radio sports show, to producing over 400 movies.