A small shuttlepod carried by the USS Defiant, used in 2374 to land on a planet wrapped in an energy barrier during the attempt to rescue Captain Lisa Cusak.
The Chaffee was a shuttlepod carried in the bay beneath the USS Defiant. It was named after Roger Chaffee, one of the three astronauts killed in the Apollo 1 fire of 1967.
It is used in The Sound of Her Voice. The Defiant picks up a distress call from Captain Lisa Cusak of the USS Olympia, stranded alone on a planet whose atmosphere she cannot breathe for long. The crew talk to her for days as they race to reach her. On arrival they find the planet ringed by a metreon energy barrier that the Defiant cannot enter, so Sisko, Bashir and O'Brien go down in the shuttlepod.
They find that Cusak died more than three years earlier; the barrier had shifted her signals through time.