Need the input from marine/army or service member. As far as I can tell, there is no etiquet for a Marine to stand at ease, or even at attention, with your hands in fron t of your body like those marines did at the Biden's blood ceremony, see first pic.
According to https://www.wikihow.com/Stand-at-Ease and all I have ever seen, a soldier stands at ease with their hands behind them, see second pic.
Standing at attention, a soldiers arms are at their sides, see pic three and four. Is there something I am missing? I honestly have never seen soldiers with their hands in front like that.