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Here is a list of all the things you can use with vsay:

NOTE: some of these might be leftovers from RTCW and may not work

EnemyDisguised: "Enemy in disguise!"
PathCleared: "Path cleared."
EnemyWeak: "The enemy is weakened."
AllClear: "All clear."
Incoming: "Incoming!"
FireInTheHole: "Fire in the hole!"
OnDefense: "I'm on defense."
OnOffense: "I'm attacking."
TakingFire: "Taking fire!"
MinesCleared: "Mines cleared."
NeedBackup: "I need backup!"
CoverMe: "Cover me!"
NeedEngineer: "We need an engineer!"
NeedOps: "We need Covert Ops!"
Medic: "Medic!"
NeedAmmo: "I need ammo!"
NeedTarget: "I need a target!"
WhereTo: "Where to?"
FollowMe: "Follow me!"
LetsGo: "Let's go!"
Move: "Move!"
ClearPath: "Clear the path!"
HoldFire: "Hold fire!"
DefendObjective: "Defend our objective!"
DisarmDynamite: "Disarm the dynamite!"
ClearMines: "Clear the mines!"
ReinforceDefense: "Reinforce the defense!"
ReinforceOffense: "Reinforce the offense!"
DestroyPrimary: "Destroy the primary objective!"
DestroySecondary: "Destroy the secondary objective!"
DestroyConstruction: "Destroy the construction!"
ObjectiveDestroyed: "Objective destroyed!"
RepairVehicle: "Repair the vehicle!"
DestroyVehicle: "Destroy the vehicle!"
EscortVehicle: "Escort the vehicle!"
FireOnTarget: "Fire on my target!"
CommandAcknowledged: "Command acknowledged!"
CommandDeclined: "Command declined!"
CommandCompleted: "Command completed!"
ConstructionCommencing: "Construction underway!"
ConstructionCompleted: "Construction completed!"
ConstructionDestroyed: "Construction destroyed!"
ObjectiveFailed: "Objective failed!"
ObjectiveCompleted: "Objective completed!"
Affirmative: "Yes!"
Negative: "No!"
Thanks: "Thanks a lot!"
Welcome: "You're welcome."
Oops: "Oops!"
Sorry: "Sorry!"
Hi: "Hi!"
Bye: "Bye."
Cheer: "Yeah!"
GreatShot: "Great shot!"
GoodGame: "Good game!"
IamSoldier: "I'm a soldier."
IamMedic: "I'm a medic."
IamEngineer: "I'm an engineer."
IamFieldOps: "I'm a field ops."
IamCovertOps: "I'm a covert ops."
FTMeetWaypoint: "Meet at waypoint!"
FTAttackWaypoint: "Attack waypoint!"
FTchecklandmines: "Check for landmines!"
FTDefendWaypoint: "Defend waypoint"
FTAttack: "Attack!"
FTFallBack: "Fall back!"
FTCheckLandMines: "Check for landmines!"
FTCoverMe: "Cover me!"
FTCoveringFire: "Soldier, covering fire!"
FTMortar: "Deploy mortar!"
FTHealSquad: "Heal the squad!"
FTHealMe: "Heal me!"
FTReviveTeamMate: "Revive team mate!"
FTReviveMe: "Revive me!"
FTDestroyObjective: "Destroy objective!"
FTRepairObjective: "Repair objective!"
FTConstructObjective: "Construct the objective!"
FTDisarmDynamite: "Disarm the dynamite!"
FTDeployLandmines: "Deploy landmines!"
FTDisarmLandmines: "Disarm landmines!"
FTCallAirStrike: "Call airstrike!"
FTCallArtillery: "Call artillery!"
FTMortarBarrage: "Call mortar barrage!"
FTResupplySquad: "Resupply squad!"
FTResupplyMe: "Resupply me!"
FTExploreArea: "Explore area!"
FTExploreAtCoordinates: "Explore at co-ordinates!"
FTSatchelObjective: "Destroy satchel objective!"
FTInfiltrate: "Infiltrate!"
FTGoUndercover: "Go undercover!"
FTProvideSniperCover: "Provide sniper cover!"