One of the things most civilians don't understand about the U.S. military is that the various branches all speak different languages. The same words can mean very different things, depending on the branch of service of the person you are saying them to.
Take, for example, the simple order "secure the building."
If you ask a Marine to "secure the building," they will hand-pick a team of a dozen Marines, who will chopper onto the roof of the building at midnight with knives clenched in their teeth. They will then work their way down floor to floor, slitting the throats of everyone they meet along the way, including the cleaning staff, because why not. When they reach the lobby, they will form up in neat ranks and scream at the top of their lungs that the building has been secured.
If you ask someone from the Army to "secure the building," they will put in a request for an artillery strike, which will pummel the building as well as most of the surrounding block into a pile of rubble. When the artillery fire stops, the highest-ranking officer available will run up to the top of the pile, plant an American flag, and tell anyone who happens to be standing around that the building has been secured.
If you ask someone from the Navy to "secure the building," they will send an encrypted message via satellite to a submarine 900 miles away. The submarine will then fire a Tomahawk cruise missile, which will fly at 500 miles per hour 100 feet off the ground into the building's HVAC exhaust. The explosion of the warhead will cause the building to collapse in on itself. The Navy will then issue a press release stating that the building has been secured.
If you ask someone from the Air Force to "secure the building," they will get you a seven-year lease with an option to buy.