Describe the Most Adverse Conditions You Have Experienced

We've all experienced some pretty harsh conditions while deployed or in the field for training. Describe one of those events where you experienced some discomfort while America slept or entertained oblivious to our activities. It could be a particular difficulty you overcame, or the hottest/coldest days you've spent in the field. Everyone has experiences seared in their memories, share them with us, and humorous anecdotes are a big plus!