Answer:
to detect and prevent counterfeiting of US currency
I'm not quiet sure what this is asking but this is appears to be related to cover letters, if that helps.
Hindsight means the same as retrospection
It's d. <span>Weeks of bottled-up tensions would be released in a few minutes of orgiastic violence, men screaming and shouting obscenities above the explosions of grenades and the rapid, rippling bursts of automatic rifles.</span>