3 US Special Forces troops was ambushed and killed in Niger. This is why knelling is Disrespectful https://t.co/X5Hm9UAy1a

— Pastor Mark Burns (@pastormarkburns) October 5, 2017

Knelling is extremely respectful.

As for kneeling (presumably while the National Anthem is being played):

› Title 36 › Subtitle I › Part A › Chapter 3 › § 301