Cessna O-2A Skymaster aka “Oscar Deuce”, this is such a quirky plane and one of the few aircraft to use the push-pull configuration.
I saw this plane during the Bluebonnet Airshow at Burnet Municipal Airport in March 2023. It flew around the airport for a bit and even demonstrated a “grenade drop”, with an explosion provided by some pyrotechnics in the background.

This particular frame had quite the life (frame history taken from www.warbirdregistry.org)
History:
Delivered to USAF as 67-21383, 1967.
Assigned to NKP, Thailand, 1967-1971.
Tranferred to Bien Hoa, South Vietnam, 1971-1974.
Transferred to Michigan ANG, Battle Creek, MI, 1974-1980.
Retired and stored, 1980-1996.
Unknown Owner, 1996-2001.
Restored to airworthy, Karen Adams Brinkley, San Antonio, TX, 2001-2005.

Registration Number: N1166B
Serial Number: 67-21383