Who is the protagonist in Joseph Heller's "Catch-22"?

In Joseph Heller's "Catch-22," the protagonist is Yossarian, a World War II bombardier who becomes increasingly disillusioned with the military and the absurdities of war. His character grapples with the chaos and moral ambiguities surrounding him, embodying the central themes of the novel, such as the struggle against bureaucratic systems and the effects of war on individual psyche. Yossarian's quest for autonomy and sanity in a world governed by illogical rules and the infamous "Catch-22" predicament serves as the narrative's driving force, highlighting his desperate attempts to survive and maintain his humanity amid the madness. His experiences and decisions throughout the story illustrate the critique Heller makes of the military and societal expectations during wartime, making him the focal point of the narrative.