Members of Congress are calling for a federal investigators to look into a defense contractor’s use of animals in training exercises. The group asked the Government Accountability Office to investigate Tier 1 Group for “live tissue training,” which uses animals to train service members on the treatment of combat-related injuries. The Agriculture Department issued a warning to Tier 1 last month after previously citing the company for violating the federal Animal Welfare Act during training exercises in May and last August. The company did not use the right type of anesthesia on live animals during a training exercise and did not properly…