What is the position of the player who is from the United States and has 30 minutes? 
CREATE TABLE table_23963781_3 (position VARCHAR, nationality VARCHAR, minutes VARCHAR)
SELECT position FROM table_23963781_3 WHERE nationality = "United States" AND minutes = 30
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_23963781_3 (position VARCHAR, nationality VARCHAR, minutes VARCHAR) Question: What is the position of the player who is from the United States and has 30 minutes?  [/INST] SELECT position FROM table_23963781_3 WHERE nationality = "United States" AND minutes = 30 </s>