“A standing army is one of the greatest mischiefs that can possibly happen.”

 The US Consrtitution is broken. To be honest having a written constitution is meaningless if no one understands what it means, or follows it.

I've pointed out that the US Constitution doesn't mention self-defence, but it does mention the common defence and shows great concern for the military establishment.

Under the United States Constitution, war powers are divided. Under Article I, Section 8, Congress has the power to:

•     declare war
•     grant Letters of Marque and Reprisal (i.e., license private citizens to capture enemy vessels)
•     raise and support Armies (for terms up to two years at a time)
•     provide and maintain a Navy
•     make Rules for the Government and Regulation of the land and naval Forces
•     provide for calling forth the Militia
•     make Rules concerning Captures on Land and Water
•     provide for organizing, arming, and disciplining, the Militia; and
•     govern such Part of [the militia] as may be employed in the Service of the United States.

Section 8 further provides that the states have the power to:

•     Appoint the Officers of the Militia; and
•     train and equip the Militia according to the discipline prescribed by Congress.

Article II, Section 2 provides that:

    "The president shall be Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States, when called into the actual Service of the United States"

The US engaged in acts of war without congressional approval during the Vietnam war, which led to the introduction of the War Powers Resolution which is a federal law intended to check the U.S. president's power to commit the United States to an armed conflict without the consent of the U.S. Congress. The resolution was adopted in the form of a United States congressional joint resolution. 

The failure of getting congressional approval means this is an illegal war. 

The War Powers Resoultion provides that the president can send the U.S. Armed Forces into action abroad only by Congress's "statutory authorization", or in case of "a national emergency created by attack upon the United States, its territories or possessions, or its armed forces".  

The attack on Iran shows that the commander in chief should not be the president of the United States.

One of the reasons I put this under Second Amendment was that part of the constitution was supposed to guarantee that institution would form the defence of the nation. As I have said before, the idea was to have a military where training and  administration would be handled by full time, professional soldiers, while the bulk of the forces would be part timers.

This system was what Switzerland had and is perfect for a peaceful and neutral nation since it discourages actions like those taken by Trump. As Jesse Ventura pointed out, make the people who make the decisions go to war. But under a militia, everyone is subject to military duty during a conflict, which should discourage belligerent actions.

And the founders were discussing the military when they discussed the Second Amendment, which is something which can be confirmed if you look up "founding fathers on standing armies". I keep mentioning the Virginia Bill of Rights of 1776 since provides a good idea of what the founders' mindset happened to be:

13. That a well regulated militia, composed of the body of the people, trained to arms, is the proper, natural, and safe defence of a free state; that standing armies, in time of peace, should be avoided, as dangerous to liberty; and that, in all cases, the military should be under strict subordination to, and governed by, the civil power.

The founders would be appalled with the current state of the Union.