Actually I thought about these two as well. However please notice that both the NA-16, BT-14 and their derivatives had the Pitot tube at the starboard wing while the one of the 115th squadron had it at the port one. Also I agree with Yves that the NA-16 had the spats mostly.
What is more the list of the planes used by the CNG squadron doesn't mention these kites ....
JN-4, DH-4, TW-3, PT-1, BT-1, O–2, and O–17 during period 1924–1932
Douglas O-38, 1931–1942
North American O-47, c. 1942–1943
But judging by the engine cowling with the antiglare strip, the wing dihedral, the shape of the prop blades, the shape of the landing gear seen partially and the Pitot tube at the port wing tip I would say it could be the Vultee BT-13 Valiant.
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