People forget most people who join the US military are increasingly minorities and from lower economic classes of US society.
Basically Hispanics, Asians, Arabs, Indians, and Blacks who need a job and the benefits package of post military life (health insurance and GI bill). Without these benefits they would be resorting to working menial jobs in society. So to them it makes sense to serve for several years.Whites enlisting are mostly from rural red states and conservatives, but becoming less and less % of the total U.S. military each year.
So yeah I’m not suprised that there are segments of the U.S. military that protest like this or don’t want to be in this war. Their original reason to signing up wasn’t to fight and to serve their country. They are there for a paycheck and benefits like any other worker.