Because of high altitude sickness which is affected by climbing up high were there is high altitude.
High altitude is were there is to much oxygen up high, if you breech in to much oxygen you could faint.
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Gas masks were gradually developed in the 1800s and the exact year you need is in the link below.
You do not need a high school diploma to join the armed forces. Upon recruitment, the armed services provide you with the training you will need to serve in the branch of the military.
The Navy traditionally allows beards due to their need to PRESERVE drinking/hygiene water for the vessel's crewmen. The Army allowed beards for partly for the same reasons prior to WW1. From WW1 onward, beards had to be removed for men to be able to properly fit (wear) their gas masks.
the answer to the people who were persecuted by the Nazis because of their religion is the JEWS no need to thank me <3 =)
to get visas to go to a safe place