The Sororitas are quite adept in burning them off with Flamers. For emergencies they even have a handheld version a girl can carry in her purse. The hardest tentacles get treated with Meltaguns first, though.
No.
https://en.wikipedia.org/wiki/United_States_military_deployments#Current_deployments
Maybe Diego Garcia - but they will die to starvation anyway, so who cares?