[RENA HANDS]

I wouldn’t just say ‘Korea’ in the second sentence, it’s a proper noun so say its full name.
Your being self redundant, if you’re going to ‘bomb’ another country because they ‘harbored WMDs’ then saying they wanted to ‘bomb in fear of retaliation’…you could combine the first two paragraphs. Actually you could combine the first three paragraphs.

Not to sound ‘witchy,’ but how would the ‘intelligence’ know accurately that ‘all personnel, including high ranking military officers’ would be at this installation?

What was this ‘gas’ used? What was the ‘bomb’ used by the North Koreans?

For me personally, I am not impressed by ‘this’ prologue…Why not start off with the Americans; scientists, government officials, military officers all in some ‘War Room’ strategizing the coming ‘fall out?’ Have radar screen glowing, screaming officials, chaotic telephone conversations…there is just so many ways you could have introduced this then refer back to America’s final ‘hope,’ the frozen Marines…Then somehow work in the ‘effects’ of this ‘zombie’ making virus. I will hold off on rating this story until I read further.