Question: When did the Waterloo of the country where Apache helicopters are based in the country that recently voted to leave an example of a federal union occur?

<P0-S0> Until recently, in the absence of prior agreement on a clear and precise definition, the concept was thought to mean (as a shorthand) 'a division of sovereignty between two levels of government'. <P0-S1> New research, however, argues that this cannot be correct, as dividing sovereignty - when this concept is properly understood in its core meaning of the final and absolute source of political authority in a political community - is not possible. <P0-S2> The descent of the United States into Civil War in the mid-nineteenth century, over disputes about unallocated competences concerning slavery and ultimately the right of secession, showed this. <P0-S3> One or other level of government could be sovereign to decide such matters, but not both simultaneously. <P0-S4> Therefore, it is now suggested that federalism is more appropriately conceived as 'a division of the powers flowing from sovereignty between two levels of government'. <P0-S5> What differentiates the concept from other multi-level political forms is the characteristic of equality of standing between the two levels of government established. <P0-S6> The leading example of the federal union of states is the European Union. <P0-S7> This clarified definition opens the way to identifying two distinct federal forms, where before only one was known, based upon whether sovereignty resides in the whole (in one people) or in the parts (in many peoples): the federal state (or federation) and the federal union of states (or federal union), respectively. <P0-S8> Leading examples of the federal state include the United States, Germany, Canada, Switzerland, Australia and India. <SEP> <P1-S0> The Army Air Corps (AAC) is a component of the British Army, first formed in 1942 during the Second World War by grouping the various airborne units of the British Army (which are no longer part of the AAC). <P1-S1> Today, there are eight regiments (7 Regular Army and 1 Reserve) of the AAC as well as four Independent Flights and two Independent Squadrons deployed in support of British Army operations across the world. <P1-S2> They are located in Britain, Brunei, Canada, and Germany. <P1-S3> Some AAC squadrons provide the offensive and air assault elements of 16 Air Assault Brigade through Joint Helicopter Command. <SEP> <P2-S0> the battle of apache pass was fought in 1862 at apache pass, arizona, in the united states, between apache warriors and the union volunteers of the california column as it marched from california to capture confederate arizona and to reinforce new mexico's union army. <P2-S1> it was one of the largest battles between the americans and the chiricahua during the apache wars. <SEP> <P3-S0> switzerland joined the council of europe in 1963. in 1979 areas from the canton of bern attained independence from the bernese, forming the new canton of jura. <P3-S1> on 18 april 1999 the swiss population and the cantons voted in favour of a completely revised federal constitution.in 2002 switzerland became a full member of the united nations, leaving the vatican city as the last widely recognised state without full un membership. <P3-S2> switzerland is a founding member of the efta, but is not a member of the european economic area. <P3-S3> an application for membership in the european union was sent in may 1992, but not advanced since the eea was rejected in december 1992 when switzerland was the only country to launch a referendum on the eea. <P3-S4> there have since been several referendums on the eu issue; due to opposition from the citizens, the membership application has been withdrawn. <P3-S5> nonetheless, swiss law is gradually being adjusted to conform with that of the eu, and the government has signed a number of bilateral agreements with the european union. <P3-S6> switzerland, together with liechtenstein, has been completely surrounded by the eu since austria's entry in 1995. on 5 june 2005, swiss voters agreed by a 55% majority to join the schengen treaty, a result that was regarded by eu commentators as a sign of support by switzerland, a country that is traditionally perceived as independent and reluctant to enter supranational bodies. <SEP> <P4-S0> In a referendum on 23 June 2016, 51.9% of the participating UK electorate voted to leave the EU, out of a turnout of 72.2%. <P4-S1> On 29 March 2017, the UK government invoked Article 50 of the Treaty on the European Union. <P4-S2> The UK is thus due to leave the EU on 29 March 2019. <SEP> <P5-S0> The events at Suez wounded British national pride, leading one MP to describe it as "Britain's Waterloo" and another to suggest that the country had become an "American satellite". <P5-S1> The Suez Crisis very publicly exposed Britain's limitations to the world and confirmed Britain's decline on the world stage, demonstrating that henceforth it could no longer act without at least the acquiescence, if not the full support, of the United States. <P5-S2> Margaret Thatcher later described the mindset she believed had befallen the British political establishment as "Suez syndrome", from which Britain did not recover until the successful recapture of the Falkland Islands from Argentina in 1982.