In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Q: Seeley Booth: You were with the 720 MP Battalion ?
Red Hudmore: Do n't tell me you heard of us .
Temperance Brennan: I have not
Seeley Booth: Bones , the _ 720 _ was the only battle - tested MP battalion in Vietnam . My pops , my grandfather , he served with them back in the ' 50s .
Red Hudmore: Soldiers of the Gauntlet . That 's what they called us .
Seeley Booth: That 's right . Soldiers of the Gauntlet . It was an honor to meet you , sir .
A:
battalion