For
It saves money and strengthens alliances.
Against
It creates dependence and weaker security control.
Anonymous excerpts, translated where noted.
“There are four ways to win a war as a small country. First is to have strong friends.”
“They rely on NATO for a significant portion of their military needs”
“First way does not work if the protector chickens out.”
“A USA that invaded Greenland is not a USA that can be relied on to defend the UK in any way.”