Looney Tunes films are in the public domain since their copyright expired, while Private Snafu is work of US Government. (in order: Booby Traps, A Tale of Two Kitties, Eatin' on the Cuff or The Moth Who Came to Dinner , & Wacky Blackout)
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.