Lowest Viet Toll in Six MonthsSAIGON lt;AP) - U.S. combal casualties in the Vietnam war droped to their lowest level in six months last week with 114Americans killed, 893 woundedand five missing, the U.S. Com*mand announced today.The command said 164 were killed and 1,442 wounded theweek before.But the sharpest decline last week was in the number ofSouth Vietnamese troops reported killed in action- 76 compared with 183 the week before.The number of Communists killed dropped to 1,393, the lowest since the week that ended .June 10, the U.S. Command said. But U.S. headquarters saidthe kill ratio of 6.8 to I for the allies last week was the highest this year and possibly one of the highest of the war.Another hullThe low' casualty figures reflected another relative lull inthe ground war and did not include the casualties in the disastrous fire aboard the earner Forrestal Saturday.A U.S. spokesman explainedthat it was not known yet whether these would be classified as combat or operational casualties since the fire and explosions began with an accident as the carrier was preparing to launchstrikes against North Vietnam.The Forrestal casualties increased to 131 dead today with the death of (wo injured men. Three are missing and 62 others were injured.The U.S. Command announced three new operations of battalion size but reported significant contact in only one of them.U.S. pilots flew 161 missions against North Vietnam Wednesday, their biggest day since duly 13, when 170 missions were flown, and a Viet Cong bombardment wounded 27 Ameri-cans— nine of themseriously and set s o m a stores on fire al the U.S. Navy base and petroleum storage ! area at Nha Be, 10 miles southeast of Saigon.j .let Crashes%One U.S. jet attacking the Heel j gun positions crashed due to mechanical trouble but the pilot was rescued.Communist guerrillas also ambushed a U.S. Marine mine-, | sweeping unit on a dirt road 21 ; miles west of Da Nang Wednes-: day, killing 15 Leathernecks and j wounding one. A U. vS. spokes-! man said two Communists were S known kilted.