Successfully complete the game to unlock the following ammo for purchase from Drebin:

Emotive Cry - causes soldiers 'Cry' emotion to activate
Emotive Laughter - causes soldiers 'Laughter' emotion to activate
Emotive Rage - causes soldiers 'Rage' emotion to activate
Emotive Scream - causes soldiers 'Scream' emotion to activate
Smoke Grenade Blue
Smoke Grenade Green
Smoke Grenade Red
Smoke Grenade Yellow