This was the same Benaiah who was one of the elite men of the Thirty and in command of the Thirty. His son Ammizabad was responsible for his division.

and Ishmaiah the Gibeonite, a mighty one among the thirty, and over the thirty, and Jeremiah, and Jahaziel, and Johanan, and Josabad the Gederathite.

This is the list of David’s mighty men: Jashobeam, the son of a Hachmonite, the chief of the thirty [heroes]. He lifted up his spear against three hundred whom he killed at one time.

He was the most honored of the Thirty, but he did not become one of the Three. David put him in charge of his bodyguard.

And the Levites were numbered from thirty years old and upward; and their number, by their polls, man by man, was thirty-eight thousand.

Then the Spirit came upon Amasai, leader of the Thirty, and he said, "David, we belong to you; we're with you, son of Jesse! Peace, peace to you, and peace to the one who helps you! For your deliverer is your God."

Of Naphtali one thousand captains, and with them with shield and spear thirty-seven thousand.

of the sons of Gershom, Joel the chief, and his brothers one hundred thirty;

As for Abshai the brother of Joab, he was chief of the thirty, and he swung his spear against three hundred and killed them; and he had a name as well as the thirty.

And the sons of Bela: Ezbon and Uzzi, and Uzziel, and Jerimoth, and Iri; five; heads of the house of their fathers, mighty, strong ones; and they being enrolled twenty and two thousand and thirty and four.

And with them by their generations, according to their fathers' houses, were military bands for war, thirty-six thousand; for they had many wives and sons.

six were born to him in Hebron. And there he reigned seven years and six months. And in Jerusalem he reigned thirty-three years.

And they hired thirty-two thousand chariots, and the king of Maacah and his people; and they came and encamped before Medeba. And the children of Ammon gathered together from their cities, and came to battle.

And three of the thirty chiefs went down to the rock to David, to the cave of Adullam, when the army of the Philistines was encamped in the valley of Rephaim.

Adina the son of Shiza the Reubenite, a captain of the Reubenites, and thirty with him;

And the time that he reigned over Israel was forty years: he reigned seven years in Hebron, and he reigned thirty-three years in Jerusalem.