Board Thread:Unanswered Questions/@comment-75.95.173.188-20150126171324/@comment-1824272-20150126211801

More information is available at Sortie Fuel, but here's a simple run-down:
 * Forced Sortie begins every Friday at 8 AM GMT, and ends on Monday at 8 AM GMT. Use a time zone converter to convert this to your time zone.
 * Recently, Forced Sortie has started to end on Tuesdays at 8 AM GMT, depending on some tournaments being active.
 * When these Forced Sortie events are going on, you can enter a room and choose how many fuel cells you want to use. If you are given the option to use more than 1, then Forced Sortie is active; if you are not given such an option, then Forced Sortie is not active.
 * Using different amounts of fuel (Supplied or Stocked, doesn't matter) gives the following outcomes:
 * 1 fuel - no change in rewards
 * 2 fuel - 2.1x credits, 2.1x research, 2.0x tournament points, 2 red/gold boxes instead of 1
 * 3 fuel - 3.5x credits, 3.5x research, 3.0x tournament points, 3 red/gold boxes instead of 1
 * Using multiple fuel on one mission does not count for Challenges; it still counts as one sortie for the challenges you have active.
 * Forced Sortie is an optional event. You can still use 1 fuel as normal and nothing will change for you.