Kalmar "Buck Sergeant" yawanci tana nufin wani ma'aikaci mara izini a cikin soja, musamman a cikin Sojojin Amurka da Marine Corps. Yawanci yana daidai da matsayin Ma'aikacin Sajan a Sojan Sama ko Sajan Na Farko a Soja. Babban Sajan Buck ne ke da alhakin jagorantar ƙaramin rukunin sojoji da kuma taimaka wa sajan ɗin wajen gudanar da ayyuka na yau da kullun.
