Final answer:
To walk my post in a military manner and be always on the alert is encapsulated in General Order Number One, emphasizing vigilance and professionalism in the military.
Step-by-step explanation:
To walk my post in a military manner, keeping always on the alert and observing everything that takes place within sight or hearing is General Order Number One. This general order is fundamental in military training and ensures that those on guard duty remain vigilant at all times, maintaining the security and readiness of their unit. In military doctrine, the discipline and conduct of soldiers are of utmost importance, and adherence to standing orders such as this underscores the professionalism expected within the armed forces.