An alpha strike is a competitive gaming term, denoting an all-out attack launched in hopes of achieving a decisive advantage. This is usually considered a risky tactic, as if the attacker fails to gain a decisive advantage, it can leave the attacker's units overextended and vulnerable to counter-attack

Counter-Attack

Counter-Attack is a 1945 war film starring Paul Muni and Marguerite Chapman as two Russians trapped in a collapsed building with seven enemy German soldiers during World War II...

.

It may have originated from Vietnam-era U.S. military jargon

Alpha strike (United States Navy)

Alpha strike is a term used by the United States Navy to denote a large air attack by an aircraft carrier air wing, first coined during the Vietnam War. It is the Navy's version of the more widely used term "strike package"....

denoting an aircraft carrier-based combat mission where "all aircraft from a single carrier were organized into one strike group for a mission against a given target".