I'm guessing you're not in the US (or UK) where IED and PTSD acronyms have been used so much in the context of physical and psychological injury in the Middle East tha they are pop culture hard to avoid knowing. Certainly, in the US, the first term that pops up in a search for IED is:

IED

/ˌīēˈdē/

noun: a simple bomb made and used by unofficial or unauthorized forces.

Danger UXB (UneXplodedBomb) was a popular British drama 30+ years ago.