Bellicist

The bellicist was sure to advocate an end to the policy of appeasement.

Source: wiktionary

Or, if you deem that that word connotes non-resistance, though to the immense bulk of Pacifists it does not, you would be an anti-Bellicist, to use a dreadful word coined by M. Emile Faguet in the discussion of this matter. [Refers to the book: Émile Faguet, Le Pacifisme (French), 1908.]

Source: wiktionary

As for what are called ‘war books,’ whether written from the pacifist or bellicist point of view, more or less brilliant reporting with emphatic or cynical anecdotes, surely there has been enough of them in the United States as well as in France and in England.

Source: wiktionary

It may be that this standard definition errs, in representing every state structure as essentially based on conflict: it involves, as the writer pointed out in an address delivered long ago in 1915, a “bellicist theory of state structure.” […] It may be well, therefore, to discard the “bellicist” idea of a state essentially based on conflict and involving a superior body which forcibly imposes its will on the mass. [Refers to the paper: Dr. Thomas Baty, "The Bellicist Theory of State Structure", 1915.]

Source: wiktionary