Sgt. Sgt. João Flávio de Freitas Costa

Registry record

Past roles

Brazilian Air Force sergeant; Operação Prato second-in-command and co-compiler of the final report (per Bob Pratt)

UAP involvement

Documented observations during Operação Prato with Capt. Hollanda

Principal disclosures

Daughter Francimari Costa described family UFO watches near Colares and objects emerging from water (secondhand via Pratt, 1999)

Knowledge type

Military field investigator; family accounts secondhand

Corroboration

Other interviews describe differing command arrangements; son Fernando Costa publicly disputes sensational claims about his father's death and bodily marks

Assessment

Role in investigation documented by researchers; do not repeat unverified implant/death rumors

Rank source

Bob Pratt compilation (SRC-V99-050) – verify

Last reviewed

2026-11-12

Evidence (1)

• Sgt. Flávio Costa named as Hollanda's second-in-command; daughter described family UFO watches; son Fernando Costa disputes sensational claims about his father's death and bodily marks DocumentedFirsthand
  E-V99-047 · 1977–1978; family accounts 1999 and 2000s · Researcher report and family counter-testimony