~Medals~What do they mean?

Hi, it's me again!

Can someone tell me what someone would have to do to get each of these medals, or what they mean. (also, the loops, stars, etc) Or if all WWII Veterans received these medals.

~Good Conduct Medal with Bronze Clasp w/ 2 Loops.
~American Theator(sic) Medal.
~World War Two Victory Medal.
~American Defense Medal.
~Air Medal w/ 2 OLC's.
~Presidential Unit Citation.
~Eorupean, African, Middle-Eastern Campaign Medal w/ 1 Silver Battle Star.
~Marksman w/ Carbine Bar.
~Honorable Service Lapel Button.
~National Defense Medal.

Thank you very much!

Tahmarrah