After more than  hours on the lunar surface, in addition to the scientific instruments, the astronauts left behind: an Apollo 1 mission patch in memory of astronauts Roger Chaffee, Gus Grissom, and Edward White, who died when their command module caught fire during a test in January 1967; two memorial medals of Soviet cosmonauts Vladimir Komarov and Yuri Gagarin, who died in 1967 and 1968 respectively; a memorial bag containing a gold replica of an olive branch as a traditional symbol of peace; and a silicon message disk carrying the goodwill statements by Presidents Eisenhower, Kennedy, Johnson, and Nixon along with messages from leaders of 73 countries around the world.
ˈæftɚ mˈoːɹ ðɐn ˈaʊɚz ɔnðə lˈuːnɚ sˈɜːfɪs, ɪn ɐdˈɪʃən tə ðə saɪəntˈɪfɪk ˈɪnstɹəmənts, ðɪ ˈæstɹənˌɔːts lˈɛft bᵻhˈaɪnd: ɐn ɐpˈɑːloʊ wˈʌn mˈɪʃən pˈætʃ ɪn mˈɛmɚɹi ʌv ˈæstɹənˌɔːts ɹˈɑːdʒɚ tʃˈæfiː, ɡˈʌs ɡɹˈɪsəm, ænd ˈɛdwɚd wˈaɪt, hˌuː dˈaɪd wɛn ðɛɹ kəmˈænd mˈɑːdʒuːl kˈɔːt fˈaɪɚ dˈʊɹɹɪŋ ɐ tˈɛst ɪn dʒˈænjuːˌɛɹi nˈaɪntiːnhˈʌndɹɪd sˈɪksti sˈɛvən; tˈuː məmˈoːɹɪəl mˈɛdəlz ʌv sˈoʊviət kˈɑːzmənˌɔːts vlˈædɪmˌɪɹ kˈɑːmɐɹˌɑːv ænd jˈuːɹi ɡˈæɡɚɹˌɪn, hˌuː dˈaɪd ɪn nˈaɪntiːnhˈʌndɹɪd sˈɪksti sˈɛvən ænd nˈaɪntiːnhˈʌndɹɪd sˈɪksti ˈeɪt ɹᵻspˈɛktɪvli; ɐ məmˈoːɹɪəl bˈæɡ kəntˈeɪnɪŋ ɐ ɡˈoʊld ɹˈɛplɪkə əvən ˈɑːlɪv bɹˈæntʃ æz ɐ tɹɐdˈɪʃənəl sˈɪmbəl ʌv pˈiːs; ænd ɐ sˈɪlɪkən mˈɛsɪdʒ dˈɪsk kˈæɹiɪŋ ðə ɡˈʊdwɪl stˈeɪtmənts baɪ pɹˈɛzɪdənts ˈaɪzənhˌaʊɚ, kˈɛnədi, dʒˈɑːnsən, ænd nˈɪksən ɐlˈɔŋ wɪð mˈɛsɪdʒᵻz fɹʌm lˈiːdɚz ʌv sˈɛvənti θɹˈiː kˈʌntɹiz ɚɹˈaʊnd ðə wˈɜːld.