That is one of the game's limitations, in that you can only 'rescue' that which is rescuable... Sorry - my old job of double-speak perculated to the surface... The pilots that you can rescue in the "lifeguard" missions are within a set area (MapZone), and you have to have an assigned objective to get them. In the stock v1.4, only the Americans have a 'Survivor' on their roster, but there isn't any reason they couldn't be added to other countries' roster ~and~ a person could also make lifeboats as 'survivors', and then be able to be picked-up. FotRSU (for v1.5 of SH4) will have that feature with the next release. If a country has them on the roster, they can be picked-up, though with some difficulty. Hoever, no points for doing it.