If you die, you won’t have to do the dishes!
The real secret is Indoctrination. You can’t just up and ask strangers to die for you, you have to carefully brainwash them first. The 72 virgin thing won’t work for you because it sounds Ridiculous until you hear it a few thousand times from people you trust.
“So they’ve got us surrounded, good! Now we can fire in any direction, those bastards won’t get away this time!”
Col. Chesty Puller, Chosin Reservior, Korea, 1950.
“Perhaps it’s fate that today is the Fourth of July, and you will once again be fighting for our freedom… Not from tyranny, oppression, or persecution… but from annihilation. We are fighting for our right to live. To exist. And should we win the day, the Fourth of July will no longer be known as an American holiday, but as the day the world declared in one voice: “We will not go quietly into the night! We will not vanish without a fight!” We’re going to live on! We’re going to survive! Today we celebrate our Independence Day!”
“Farm boy, fetch me that pitcher of iocaine.”
While your there find the WMD.
I always liked:
“When I first joined the Army, we were still fighting Colonial wars. If you saw a man in a skirt, you shot him and nicked his country.”- Captain Edmund Blackadder. 
I say “here, hold this” at the grenade range.
They’re dying near me, though, not specifically for me.
Die in everlasting glory, or live in everlasting ignominy, which do you prefer?
I thought so. Come on, boys!
“Trooper, take your squad and kill those annoying little Ewoks, should be a piece of cake.”
“Yes sir!”
“‘Little Big Horn’? What a goofy name for this place. C’mon boys, let’s go kill us some Injuns!”
…and I just found:
“The time is now near at hand which must probably determine whether Americans are to be freemen or slaves; whether they are to have any property they can call their own; whether their houses and farms are to be pillaged and destroyed, and themselves consigned to a state of wretchedness from which no human efforts will deliver them. The fate of unborn millions will now depend, under God, on the courage and conduct of this army. Our cruel and unrelenting enemy leaves us only the choice of brave resistance, or the most abject submission. We have, therefore, to resolve to conquer or die.” *
– George Washington, Address to the Continental Army before the Battle of Long Island (August 27, 1776) *
"I know we’re playing Russian Roulette and my turn, but I *really need * you to go in placd, just this once.
One rifle for every two men! When the man in front of you falls, pick up the rifle!
That’s “go in my place, just this once.”
“Gentlemen: it is true you have no arms; your enemy, however, to all appearance, have plenty. My advice to you therefore is that as there happens to be a great abundance of stones upon this moor, every man should provide himself, in the first place, with as stout a one as he can manage, rush up to the first Covenanter he meets, beat out his brains, take his sword, and then I believe he will be at no loss how to proceed!”.
“Come on men! They couldn’t hit the broad side of a barn fr…*”
– George Gipp to Notre Dame’s Knute Rockne, 1920
Hey, it’d work for me.
“You do not know pain! You do not know fear! You will taste Man-flesh!”
That only works if you’re Uruk-Hai . . . or a gay man or straight woman.
"Sons of Gondor! Of Rohan! My brothers! I see in your eyes the same fear that would take the heart of me. A day may come when the courage of men fails; when we forsake our friends and break all bonds of fellowship… but it is not this day! An hour of wolves and shattered shields, when the Age of Men comes crashing down! But it is not this day! This day we fight! By all that you hold dear on this good earth, I bid you stand! Men of the West! "