The word militará is the future form of militar in the third person singular.
See the full militar conjugation

militar

Por último, la UNESCO militará en favor del respeto de los compromisos asumidos en el marco del Consenso de Monterrey. La Sra.
Lastly, UNESCO would campaign for respect for the commitments undertaken within the framework of the Monterrey Consensus.
Me gustaría que este Parlamento militara firmemente en el bando del hombre no razonable.
I would like to think that this Parliament is firmly on the side of the unreasonable man.
Cargo oficial: Jefe del Hospital Militara de las Fuerzas Armadas
Official function: Head of the Armed Forces Military Hospital
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