Louisville chief: Police and National Guard enforcing curfew fatally shot a man after someone in...

Also,I guess we've answered the question, again, as to whether Soldiers will fire on their own citizens.

No positive ID on a target? Why is the National Guard returning fire?

I have always been against 'No-knock' Warrants.
The Fourth Amendment of the U.S. Constitution provides that "the right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized."
Though it doesn't say specifically 'No-Knock', the culture at the time required persons to ask permission to enter and to receive said permission prior to entrance.
No-Knock Warrants are simply a way to subvert the intent of the 4th Amendment. Any military person will tell you that the Commander's Intent out-weighs all others consideration in their OPORDs.
Usage of No-Knock Warrants should have been suspended a long time ago and indeed never approved by any elected or appointed authority.
By-the-by the 4th Amendment applies to US citizens and is only allowed to apply to foreign nationals as it is impossible for Law Enforcement to know prior the nationality of individuals within a dwelling.