IN 1969, A SENIOR OFFICER MATERIEL REVIEW BOARD RECOMMENDED THAT THE M60A1 TANK BE PRODUCT IMPROVED. FIGURE 3 SHOWS THE PROGRESS WE HAVE MADE SO FAR AND THE PLANS FOR THE IMMEDIATE FUTURE. IN 1971, THE TOP LOADING AIR CLEANER WAS INTRODUCED, FOLLOWED BY INTRODUCTION OF THE AOS IN 1972, THE T142 TRACK IN 1974, THE RISE ENGINE AND IMPROVED ELECTRI CAL SYSTEM IN 1975. THE THREE PASSIVE IMAGE INTENSIFICATION NIGHT DEVICES AND THE DEEP WATER FORDING KIT WERE INCORPORATED INTO ARMY PRODUCTION TANKS BEGINNING IN MAY 1977. M60A3 PI TANK PROGRAM