Definitely against it, except for war crimes, people like bin Laden and so on.
By the way, I had no idea that the US was still doing executions by firing squad. A man chose to die this way a few years ago.
I think that’s the only state. Not sure if it’s still a choice though.
Edit: Those sentenced to death no longer have the choice of a firing squad, but since the law taking away that choice was not retroactive, those previously sentenced to death still had the option.
A law passed on March 15, 2004 banned execution by firing squad in Utah, but since that specific law was not retroactive, four inmates on Utah's death row (one, Roberto Arguelles, died of natural causes while on death row) could still opt for execution by firing squad.
Ronnie Lee Gardner was executed by five anonymous officers on June 18, 2010. In February 1996, Gardner threatened to sue to force the state of Utah to execute him by firing squad. He said that he preferred this method of execution because of his "Mormon heritage." Gardner also felt that lawmakers were trying to eliminate the firing squad, in opposition to popular opinion in Utah, because of concern over the state's image in the 2002 Winter Olympics.
Since 1976, when the death penalty was reinstated in the U.S., Utah has executed 7 people. The state has a population of just under 3 million.
Texas with a population of nearly 25 million has had 475 executions. So about 6 times the population and about 9 times the executions.
Here’s the list of executions by state.