J1两年服务期

我项目出资去美国做一年访问学者，签证明年4月13日到期，2019表到期是7月30日。如果我4月份回国，过了签证有效期，需要续签，不知道是不是要回国服务两年？
在领事馆教育处看到这个：
Two-year Home-country Physical Presence Requirement Conditions - An exchange visitor is subject to the two-year home country physical presence requirement if the following conditions exist:
Government funded exchange program - The program in which the exchange visitor was participating was financed in whole or in part directly or indirectly by the U.S. government or the government of the exchange visitor's nationality or last residence; Graduate medical education or training - The exchange visitor entered the U.S. to receive graduate medical education or training;

Specialized knowledge or skill: Skills List - The exchange visitor is a national or permanent resident of a country which has deemed the field of specialized knowledge or skill necessary to the development of the country, as shown on the Exchange Visitor Skills List. Review the Exchange Visitor Skills List 2009.这个的意思是不是只有国家公派、特殊技能和医学的才需要2年回国服务期呀？谢谢！