The freedoms that all Americans enjoy, and often take for granted, have all been won and preserved by those who were willing to put their lives at risk and wear the uniform of the United States Army, Air Force, Navy, or Marine Corps.  Countless families throughout our history and many today are torn asunder as loved ones have left for foreign soil to combat tyrants or otherwise protect American interests.  Many families have forever lost their loved ones, who paid the ultimate price for freedom by being killed or lost in war. 
These are the foremost Givers to our society, and nothing that we have today would exist without their sacrifices.  My two favorite quotes regarding this subject follow, I hope you enjoy them.

“War is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth war is much worse. The person who has nothing for which he is willing to fight, nothing …which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself.” –John Stewart Mill

“It is the soldier, not the reporter, Who has given us freedom of the press. It is the soldier, not the poet, Who has given us freedom of speech. It is the soldier, not the organizer, Who has given us the freedom to demonstrate. It is the soldier, Who salutes the flag, Who serves beneath the flag, And whose coffin is draped by the flag, Who allows the protestor to burn the flag.” – Father Dennis Edward O’Brian, USMC