Question: A country's military branch, which in the US contains the Air Defense Artillery, was unprepared for the invasion of Hana Mandlikova's birth country. When was the word "Slavs" used in the national anthem of the unprepared country?

<P0-S0> Several accomplished professional tennis players including Ivan Lendl, Jan Kodeš, Miloslav Mečíř, Hana Mandlíková, Martina Hingis, Martina Navratilova, Jana Novotna, Petra Kvitová and Daniela Hantuchová were born in Czechoslovakia. <SEP> <P1-S0> The word "Slavs" was used in the national anthem of the Slovak Republic (1939–1945), Yugoslavia (1943–1992) and the Federal Republic of Yugoslavia (1992–2003), later Serbia and Montenegro (2003–2006). <SEP> <P2-S0> In 1968, Tito offered Czechoslovak leader Alexander Dubček to fly to Prague on three hours notice if Dubček needed help in facing down the Soviets. <P2-S1> In April 1969, Tito removed generals Ivan Gošnjak and Rade Hamović in the aftermath of the invasion of Czechoslovakia due to the unpreparedness of the Yugoslav army to respond to a similar invasion of Yugoslavia. <SEP> <P3-S0> Currently, the army is divided into the Regular Army, the Army Reserve, and the Army National Guard. <P3-S1> The army is also divided into major branches such as Air Defense Artillery, Infantry, Aviation, Signal Corps, Corps of Engineers, and Armor. <P3-S2> Before 1903 members of the National Guard were considered state soldiers unless federalized (i.e., activated) by the President. <P3-S3> Since the Militia Act of 1903 all National Guard soldiers have held dual status: as National Guardsmen under the authority of the governor of their state or territory and, when activated, as a reserve of the U.S. Army under the authority of the President. <SEP> <P4-S0> ``my country, 'tis of thee '', also known as`` america'', is an american patriotic song, whose lyrics were written by samuel francis smith. <P4-S1> the melody used is the same as that of the national anthem of the united kingdom, ``god save the queen '', arranged by thomas arne. <P4-S2> the song served as one of the de facto national anthems of the united states (along with songs like`` hail, columbia'') before the adoption of ``the star - spangled banner ''as the official u.s. national anthem in 1931. <SEP> <P5-S0> a major consideration was the possible soviet reaction in the event that the us intervened. <P5-S1> the truman administration was fretful that a war in korea was a diversionary assault that would escalate to a general war in europe once the united states committed in korea. <P5-S2> at the same time, "[t]here was no suggestion from anyone that the united nations or the united states could back away from [the conflict]". <P5-S3> yugoslavia–a possible soviet target because of the tito-stalin split—was vital to the defense of italy and greece, and the country was first on the list of the national security council's post-north korea invasion list of "chief danger spots". <P5-S4> truman believed if aggression went unchecked a chain reaction would be initiated that would marginalize the united nations and encourage communist aggression elsewhere. <P5-S5> the un security council approved the use of force to help the south koreans and the us immediately began using what air and naval forces that were in the area to that end. <P5-S6> the administration still refrained from committing on the ground because some advisers believed the north koreans could be stopped by air and naval power alone.