In December 1937, José Baldero Escudero served in the 3^a Escuadrilla of the Grupo de Caza N^o 26, which was equipped with Polikarpov I-15s.

On 30 December, the 3^a/26 (I-15) claimed two Bf 109s over the Teruel area, one by teniente Juan Comas Borrás (CO) and one by Baldero.
No Bf 109s were lost this day but the Legion Condor was involved in combat during the day when the Bf 109s from 1.J/88 claimed two I-15s (Leutnant Walter Adolph and Unteroffizier Ernst Terry) and one I-16 (Oberfeldwebel Ignaz Prestele).

Baldero ended the Spanish Civil War with 1 biplane victory.

Claims:

Kill no.	Date	Time	Number	Type	Result	Plane type	Serial no.	Locality	Unit
	1937
1	30/12/37		1	Bf 109 (a)	Destroyed	I-15		Teruel area	3a/26

Biplane victories: 1 destroyed.
TOTAL: 1 destroyed.
(a) No Bf 109s were lost this day.

Sources:
Fiat CR.32 Aces of the Spanish Civil War - Alfredo Logoluso, 2010 Osprey Publishing, Oxford, ISBN 978-1-84603-983-6
Fighter Pilots Of The Spanish Republic (Vol. 1) - Rafael A. Permuy López, Historica 36/39 no. 1, ISBN 84-87314-89-9
Spanish Republican Aces – Rafael A Permuy López, 2012 Osprey Publishing, Oxford, ISBN 978-1-84908-668-4
The Legion Condor - Karl Ries and Hans Ring, 1992 Schiffer Publishing, ISBN 0-88740-339-5