yes they can be Respawned AND Deleted
ok to delete do like Oneil said
use the command Deletevehicle "Name" where Name is the name of the object to be deleted
to respawn you need a Description.ext file in the mission
in the Description.ext put
Respawn = "BASE";
RespawnDelay = 0;
change BASE to the one you desire (Group: Respawn into another person in the group, Base: Respawn at Marker, Side: havnt used it before etc...)
respawndelay is how long to wait untill the person respawns obviously
if you use BASE you must add Markers in the mission to show where they will respawn
if i remember right its
West:
Respawn_West
East:
Respawn_East
Resistance:
Respawn_Guerilla
Civilian:
Respawn_Civilian