Some have merit but #3 is just stupid. Your 'advancing enemy' would see themselves in the reflections and immediately know where you were positioned not mention the weight of heavy steel chromium covered 'mirrors' would make transport and set up difficult.

#25 Railgun a reality now.

shut up and take my money!!!!

Navy Seals use something like 13 and we have 19 everywhere these days.

For killing others, the mens have more imagination...

Well said, Limited