I finally figured out how to get the Heli waypoint + dismount squad to work so i thought i'll share what i have :D

What this Sample do:

- Player spawns alone
- Heli + pilot + squad are spawn on Player entering Zone
- Heli take off and follows waypoint path
- Heli lands on last Waypoint
- Squad Disembark and are assign to follow player
- Heli leaves and dissapear on his last Waypoint

This might be useful if you have a mission where you want the player to start alone but be helped at some point during a mission.

DOWNLOAD SAMPLE HERE

The MAP setup

The script:

function onMissionStart()
OFP:displaySystemMessage("Walk forward to Spawn Heli and crew")
end

function onEnter_triggerzone(zoneName, UnitName) -- Trigger to spawn Heli + Pilot + Squad
OFP:activateEntitySet("Allies","ADDTOFRONT") -- Spawning the Entity containing Heli + Pilot + Squad
OFP:move("Echelon2","waypointp","ADDTOFRONT") -- Heli takes off and follow Waypoint Path
OFP:disableEvent("onEnter_triggerzone") -- Removing the Trigger Event
end

function onArriveAtWaypoint_vu25mh60s_waypointI18(entityName, waypointName)
OFP:land("vu25mh60s", "ADDTOFRONT") -- Heli Lands on arriving at last Waypoint
end

function onLand_vu25mh60s(HelicopterName) -- When Heli lands do this
OFP:displaySystemMessage("Heli has landed") -- For debug
OFP:addTimer("timer1", 10000) -- Starting a 10 seconds timer
OFP:detach("Echelon2", "iu33uspilot") -- detaching the Pilot from Squad Echelon
end

function onTimer_timer1(name) -- When timer ends do this
OFP:displaySystemMessage("Crew Disembark") -- For debug
OFP:dismountVehicle("Echelon2", "OVERRIDE") -- Squad Dismount the Heli
OFP:addTimer("timer2", 5000) -- Starting a 5 seconds timer
end

function onTimer_timer2(name)
OFP:displaySystemMessage("Pilot Leaves") -- For debug
OFP:move("iu33uspilot", "waypointI1p", "OVERRIDE") -- Pilot + heli now leave and follow Waypoint Path
OFP:detach("Echelon2", "iu08usrfl") -- Detach squad member from Echelon2
OFP:detach("Echelon2", "iu15uslmg") -- Detach squad member from Echelon2
OFP:detach("Echelon2", "iu19usat") -- Detach squad member from Echelon2
OFP:attach("Echelon", "iu08usrfl") -- Squad member now under your control :D
OFP:attach("Echelon", "iu15uslmg") -- Squad member now under your control :D
OFP:attach("Echelon", "iu19usat") -- Squad member now under your control :D
end

function onArriveAtWaypoint_vu25mh60s_waypointI2(entityName, waypointName) -- When Heli arrives here do this
OFP:despawnEntity("vu25mh60s") -- Remove Heli
OFP:despawnEntity("iu33uspilot") -- Remove Pilot
OFP:removeTimer("timer1") -- Removing timer 1
OFP:removeTimer("timer2") -- Removing timer 2
end

EDIT: new download, rev 1.1 : i fixed a problem where the player could not command the Squad.