ocr: Apollo spacecraft Instrument unit IIIIIII S-IVB stage Apollo spacecraft S-II Apollo stage spacecraft Instrument unit 363ft Instrument unit S-IV 224ft stage S-IVB 188ft stage S-IC stage Apollo spacecraft 88ft S-I S-IB stage stage Little' Joe II 0 u - LIN - vehicle TF u AAA Little Joe I Saturnl Saturn IB Saturn V