Here are the results of an O-2 search that was done on  https://www.vietnamairlosses.com

 

  1. 6 August 1967: O-2A Skymaster; Ser # 67-21317, 67-21322; USAF; 20 TASS, 504 TASG; Da Nang
  2. 14 September 1967: O-2A Skymaster; Ser # 67-21314; USAF; 20 TASS, 504 TASG; Da Nang
  3. 3 November 1967: O-2A Skymaster; Ser # 67-21328; USAF; 20 TASS, 504 TASG; Da Nang
  4. 12 December 1967: O-2A Skymaster; Ser # 67-21369; USAF; 22 TASS, 504 TASG; Binh Thuy
  5. 25 December 1967: O-2A Skymaster; Ser # 67-21337; USAF; 20 TASS, 504 TASG; Da Nang
  6. 25 December 1967: O-2A Skymaster; Ser # 67-21390; USAF; 20 TASS, 504 TASG; Da Nang
  7. 17 January 1968: O-2A Skymaster; Ser # 67-21327; USAF; 20 TASS, 504 TASG; Da Nang
  8. 1 February 1968: O-2A Skymaster; Ser # 67-21339, 67-21347, 67-21357, 67-21359; USAF; 20 TASS, 504 TASG; Da Nang detached to Hue
  9. 11 February 1968: O-2A Skymaster; Ser # 67-21362; USAF; 19 TASS, 504 TASG; Bien Hoa
  10. 11 February 1968: O-2A Skymaster; Ser # 67-21401; USAF; 22 TASS, 504 TASG; Binh Thuy
  11. 16 March 1968: O-2A Skymaster; Ser # 67-21408; USAF; 23 TASS, 504 TASG; Nakhon Phanom
  12. 20 March 1968: O-2A Skymaster; Ser # 67-21338; USAF; 20 TASS, 504 TASG; Da Nang
  13. 29 March 1968: O-2A Skymaster; Ser # 67-21302; USAF; 23 TASS, 504 TASG; Nakhon Phanom
  14. 1 April 1968: O-2A Skymaster; Ser # 67-21406; USAF; 23 TASS, 504 TASG; Nakhon Phanom
  15. 21 April 1968: O-2A Skymaster; Ser # 67-21420; USAF; 20 TASS, 504 TASG; Da Nang
  16. 28 April 1968: O-2A Skymaster; Ser # 67-21367; USAF; 20 TASS, 504 TASG; Da Nang
  17. 9 May 1968: O-2A Skymaster; Ser # 67-21399; USAF; 20 TASS, 504 TASG; Da Nang
  18. 9 May 1968: O-2A Skymaster; Ser # 68-6858; USAF; 20 TASS, 504 TASG; Da Nang
  19. 10 May 1968: O-2A Skymaster; Ser # 67-21370; USAF; 22 TASS, 504 TASG; Binh Thuy
  20. 12 May 1968: O-2A Skymaster; Ser # 67-21333; USAF; 20 TASS, 504 TASG; Da Nang
  21. 12 May 1968: O-2A Skymaster; Ser # 67-21336; USAF; 20 TASS, 504 TASG; Da Nang
  22. 21 May 1968: O-2A Skymaster; Ser # 67-21382; USAF; 23 TASS, 504 TASG; Nakhon Phanom
  23. 24 May 1968: O-2A Skymaster; Ser # 67-21335; USAF; 20 TASS, 504 TASG; Da Nang
  24. 30 May 1968: O-2A Skymaster; Ser # 67-21405; USAF; 20 TASS, 504 TASG; Da Nang
  25. 13 June 1968: O-2A Skymaster; Ser # 67-21415; USAF; 20 TASS, 504 TASG; Da Nang
  26. 26 June 1968: O-2A Skymaster; Ser # 68-6879; USAF; 20 TASS, 504 TASG; Da Nang
  27. 17 July 1968: O-2A Skymaster; Ser # 67-21384; USAF; 23 TASS, 504 TASG; Nakhon Phanom
  28. 30 July 1968: O-2A Skymaster; Ser # 68-6891; USAF; 20 TASS, 504 TASG; Da Nang detached to Chu Lai
  29. 23 August 1968: O-2A Skymaster; Ser # 67-21348; USAF; 20 TASS, 504 TASG; Da Nang detached to Chu Lai
  30. 1 September 1968: O-2A Skymaster; Ser # 67-21315; USAF; 20 TASS, 504 TASG; Da Nang
  31. 8 October 1968: O-2B Skymaster; Ser # 67-21457; USAF; 9 SOS, 14 SOW; Nha Trang
  32. 19 October 1968: O-2A Skymaster; Ser # 68-6870; USAF; 19 TASS, 504 TASG; Bien Hoa
  33. 23 October 1968: O-2A Skymaster; Ser # 67-21394; USAF; 20 TASS, 504 TASG; Da Nang
  34. 23 October 1968: O-2A Skymaster; Ser # 68-6883; USAF; 20 TASS, 504 TASG; Da Nang
  35. 17 November 1968: O-2A Skymaster; Ser # 67-21378; USAF; 23 TASS, 504 TASG; Nakhon Phanom
  36. 22 November 1968: O-2A Skymaster; Ser # 68-6859; USAF; 23 TASS, 504 TASG; Nakhon Phanom
  37. 26 November 1968: O-2A Skymaster; Ser # 67-21419; USAF; 20 TASS, 504 TASG; Da Nang
  38. 14 December 1968: O-2A Skymaster; Ser # 67-21308; USAF; 19 TASS, 504 TASG; Bien Hoa
  39. 18 January 1969: O-2A Skymaster; Ser # 67-21350; USAF; 20 TASS, 504 TASG; Da Nang
  40. 1 February 1969: O-2A Skymaster; Ser # 67-21432; USAF; 23 TASS, 504 TASG; Nakhon Phanom detached to Ubon
  41. 28 February 1969: O-2A Skymaster; Ser # 67-21412; USAF; 23 TASS, 504 TASG; Nakhon Phanom
  42. 6 March 1969: O-2A Skymaster; Ser # 67-21386; USAF; 23 TASS, 504 TASG; Nakhon Phanom
  43. 9 March 1969: O-2A Skymaster; Ser # 67-21425; USAF; 23 TASS, 504 TASG; Nakhon Phanom
  44. 16 April 1969: O-2A Skymaster; Ser # 67-21437; USAF; 19 TASS, 504 TASG; Bien Hoa
  45. 2 May 1969: O-2A Skymaster; Ser # 67-21305; USAF; 23 TASS, 504 TASG; Nakhon Phanom
  46. 9 May 1969: O-2A Skymaster; Ser # 67-21329; USAF; 20 TASS, 504 TASG; Da Nang
  47. 25 May 1969: O-2A Skymaster; Ser # 67-21361; USAF; 19 TASS, 504 TASG; Bien Hoa
  48. 1 June 1969: O-2A Skymaster; Ser # 67-21319; USAF; 20 TASS, 504 TASG; Da Nang
  49. 2 June 1969: O-2A Skymaster; Ser # 67-21316; USAF; 20 TASS, 504 TASG; Da Nang
  50. 6 June 1969: O-2A Skymaster; Ser # 67-21325; USAF; 20 TASS, 504 TASG; Da Nang
  51. 19 June 1969: O-2A Skymaster; Ser # 68-6869; USAF; 19 TASS, 504 TASG; Bien Hoa
  52. 22 June 1969: O-2B Skymaster; Ser # 67-21455; USAF; 9 SOS, 14 SOW; Nha Trang
  53. 23 July 1969: O-2A Skymaster; Ser # 68-10851; USAF; 20 TASS, 504 TASG; Da Nang detached to Phu Bai
  54. 2 August 1969: O-2A Skymaster; Ser # 67-21332; USAF; 20 TASS, 504 TASG; Da Nang
  55. 12 September 1969: O-2A Skymaster; Ser # 68-10987; USAF; 19 TASS, 504 TASG; Bien Hoa
  56. 14 September 1969: O-2A Skymaster; Ser # 68-10854; USAF; 21 TASS, 504 TASG; Nha Trang detached to Kontum
  57. 6 October 1969: O-2A Skymaster; Ser # 68-10995; USAF; 21 TASS, 504 TASG; Nha Trang
  58. 8 October 1969: O-2A Skymaster; Ser # 67-21343; USAF; 23 TASS, 504 TASG; Nakhon Phanom
  59. 21 October 1969: O-2A Skymaster; Ser # 68-10975; USAF; 21 TASS, 504 TASG; Cam Ranh Bay
  60. 7 November 1969: O-2A Skymaster; Ser # 68-10852; USAF; probably 20 TASS, 504 TASG; Da Nang
  61. 20 November 1969: O-2A Skymaster; Ser # 67-21301; USAF; 20 TASS, 504 TASG; Da Nang
  62. 24 December 1969: O-2A Skymaster; Ser # 68-10999; USAF; 19 TASS, 504 TASG; Bien Hoa
  63. 10 January 1970: O-2A Skymaster; Ser # 68-6863; USAF; 20 TASS, 504 TASG; Da Nang
  64. 18 January 1970: O-2A Skymaster; Ser # 68-10864; USAF; 21 TASS, 504 TASG; Cam Ranh Bay
  65. 15 February 1970: O-2A Skymaster; Ser # 67-21358; USAF; 20 TASS, 504 TASG; Da Nang
  66. 11 March 1970: O-2A Skymaster; Ser # 68-6884; USAF; 20 TASS, 504 TASG; Da Nang
  67. 4 April 1970: O-2A Skymaster; Ser # 68-11058; USAF; 20 TASS, 504 TASG; Da Nang
  68. 22 April 1970: O-2A Skymaster; Ser # 68-11005; USAF; 19 TASS, 504 TASG; Bien Hoa
  69. 2 May 1970: O-2A Skymaster; Ser # 68-11064; USAF; 19 TASS, 504 TASG; Bien Hoa
  70. 11 May 1970: O-2A Skymaster; Ser # 67-21341; USAF; 20 TASS, 504 TASG; Da Nang
  71. 22 May 1970: O-2A Skymaster; Ser # 68-11002; USAF; 20 TASS, 504 TASG; Da Nang
  72. 29 May 1970: O-2A Skymaster; Ser # 68-11033; USAF; 20 TASS, 504 TASG; Da Nang
  73. 5 September 1970: O-2A Skymaster; Ser # 68-10992; USAF; 21 TASS, 504 TASG; Cam Ranh Bay
  74. 28 September 1970: O-2A Skymaster; Ser # 67-21409; USAF; 504 TASG; base unknown
  75. 1 October 1970: O-2A Skymaster; Ser # 68-10839; USAF; 19 TASS, 504 TASG; Bien Hoa
  76. 7 October 1970: O-2A Skymaster; Ser # 68-10969; USAF; 21 TASS, 504 TASG; Cam Ranh Bay detached to Ban Me Thuot
  77. 5 November 1970: O-2A Skymaster; Ser # 68-10965; USAF; 20 TASS, 504 TASG; Da Nang
  78. 12 December 1970: O-2A Skymaster; Ser # 67-21428; USAF; 23 TASS, 504 TASG; Nakhon Phanom
  79. 31 January 1971: O-2A Skymaster; Ser # 68-10841; USAF; 21 TASS, 504 TASG; Cam Ranh Bay
  80. 19 February 1971: O-2A Skymaster; Ser # 68-11001; USAF; 20 TASS, 504 TASG; Da Nang
  81. 16 March 1971: O-2A Skymaster; Ser # 68-6860; USAF; 20 TASS, 504 TASG; Da Nang
  82. 26 April 1971: O-2A Skymaster; Ser # 67-21388; USAF; 23 TASS, 504 TASG; Nakhon Phanom
  83. 20 May 1971: O-2A Skymaster; Ser # 67-21389; USAF; 20 TASS, 504 TASG; Da Nang
  84. 16 August 1971: O-2A Skymaster; Ser # 68-11030; USAF; 20 TASS, 504 TASG; Da Nang
  85. 9 September 1971: O-2A Skymaster; Ser # 68-11038; USAF; 19 TASS, 504 TASG; Bien Hoa
  86. 30 October 1971: O-2A Skymaster; Ser # 67-21439; USAF; 20 TASS, 504 TASG; Da Nang
  87. 17 February 1972: O-2A Skymaster; Ser # unknown; USAF; 21 TASS, 504 TASG; Cam Ranh Bay detached to Tan Son Nhut
  88. 2 April 1972: O-2A Skymaster; Ser # 68-10842; USAF; 20 TASS, 366 TFW; Da Nang
  89. 1 May 1972: O-2A Skymaster; Ser # unknown; USAF; 20 TASS, 366 TFW; Da Nang
  90. 11 May 1972: O-2A Skymaster; Ser # 68-11000; USAF; 21 TASS, 377 ABW; Tan Son Nhut
  91. 11 May 1972: O-2A Skymaster; Ser # 68-11004; USAF; 21 TASS, 377 ABW; Tan Son Nhut
  92. 14 May 1972: O-2A Skymaster; Ser # unknown; USAF; 21 TASS, 377 ABW; Tan Son Nhut
  93. 24 May 1972: O-2A Skymaster; Ser # 68-11056; USAF; 20 TASS, 366 TFW; Da Nang
  94. 5 June 1972: O-2A Skymaster; Ser # 68-10981; USAF; 21 TASS, 377 ABW; Tan Son Nhut
  95. 25 June 1972: O-2A Skymaster; Ser # 68-11015; USAF; 20 TASS, 366 TFW; Da Nang
  96. 26 June 1972: O-2A Skymaster; Ser # 68-10982; USAF; 21 TASS, 377 ABW; Tan Son Nhut
  97. 27 June 1972: O-2A Skymaster; Ser # 68-11026; USAF; 21 TASS, 377 ABW; Tan Son Nhut
  98. 1 July 1972: O-2A Skymaster; Ser # 68-11040; USAF; 21 TASS, 377 ABW; Tan Son Nhut
  99. 18 August 1972: O-2A Skymaster; Ser # 68-10980; USAF; 20 TASS, 6498 ABW; Da Nang
  100. 23 November 1972: O-2A Skymaster; Ser # 68-11065; USAF; 21 TASS, 377 ABW; Tan Son Nhut

 

 

 

 

 

 

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