It unlocks the bonus squadmate Zaeed, plus a few extra missions and weapons.

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But the field could develop fast, as prototype picosatellites can ride along with other missions at almost no extra cost.

ECONOMIST: Picosatellites

However, there is a growing realisation in the US and UK that allies such as Germany, France and Italy are unlikely to offer significant numbers of extra combat forces, or change the nature of their missions, says the BBC's Caroline Wyatt in Krakow.

BBC: US faces fresh Afghan obstacles