1. Repetition for Effect WHY? to emphasize certain words
to create a rhythm (that also serves the purpose of emphasis)

2. Anaphora
The successive repetition of words at the beginning of a phrase or clause
“We shall fight in France, on the seas and oceans, with growing confidence and strength in the air, on the beaches, on the landing grounds, in the fields, in the streets, and in the hills. We will never surrender.”
“We shall fight in France, we shall fight on the seas and oceans, we shall fight with growing confidence and growing strength in the air, we shall fight on the beaches, we shall fight on the landing grounds, we shall fight in the fields and in the streets, we shall fight in the hills, we shall never surrender.”

3. Anaphora
The successive repetition of words at the beginning of a phrase or clause
“We shall fight in France, on the seas and oceans, with growing confidence and strength in the air, on the beaches, on the landing grounds, in the fields, in the streets, and in the hills. We will never surrender.”
“We shall fight in France, we shall fight on the seas and oceans, we shall fight with growing confidence and growing strength in the air, we shall fight on the beaches, we shall fight on the landing grounds, we shall fight in the fields and in the streets, we shall fight in the hills, we shall never surrender.”
What other rhetorical device regarding syntax is used?

4. Epistrophe
the successive repetition of words at the end of a phrase or clause
sometimes called an epiphora (but not as often)
"I swear to tell the truth, the whole truth and nothing but the truth." 
“…this nation, under God, shall have a new birth of freedom -- and that government of the people, by the people, for the people, shall not perish from the earth.” – Abraham Lincoln, Gettysburg Address
“When I was a child, I spake as a child, I understood as a child, I thought as a child; but when I became a man, I put away childish things” – 1 Cor. 13:11

5. Epistrophe
the successive repetition of words at the end of a phrase or clause
sometimes called an epiphora (but not as often)
“Shel Turtlestein was many things, but above all he was my friend. When I didn’t get a date with Fiona Gunderson, Shel was there. When I didn’t get to play the part of Tevye, Shel was there. And when a raccoon broke into my room, unfortunately, Shel was there" – Manny Delgado’s eulogy to his pet turtle (Modern Family)

6. "And the Germans will not be able to help themselves from imagining the cruelty their brothers endured at our hands, and our boot heels, and the edge of our knives. And the Germans will be sickened by us. And the Germans will talk about us. And the Germans will fear us. And when the Germans close their eyes at night, and their subconscious tortures them for the evil they’ve done, it will be thoughts of us that it tortures them with" - Brad Pitt as Lieutenant Aldo Raine ('Inglorious Basterds')

7. "And the Germans will not be able to help themselves from imagining the cruelty their brothers endured at our hands and our boot heels and the edge of our knives. And the Germans will be sickened by us. And the Germans will talk about us. And the Germans will fear us. And when the Germans close their eyes at night and their subconscious tortures them for the evil they’ve done, it will be thoughts of us that it tortures them with" - Brad Pitt as Lieutenant Aldo Raine ('Inglorious Basterds')

8. "And the Germans will not be able to help themselves from imagining the cruelty their brothers endured at our hands and our boot heels and the edge of our knives. And the Germans will be sickened by us. And the Germans will talk about us. And the Germans will fear us. And when the Germans close their eyes at night and their subconscious tortures them for the evil they’ve done, it will be thoughts of us that it tortures them with" - Brad Pitt as Lieutenant Aldo Raine ('Inglorious Basterds')