Question:
Which position did Lennart Rönnberg hold in Jan, 1991?

Context:
 Lennart Rönnberg holds the position of regiment commander from Jan, 1983 to Jan, 1987. 
 Lennart Rönnberg holds the position of chief of staff from Jan, 1994 to Jan, 1997. 
 Lennart Rönnberg holds the position of Chief of the Army Staff from Jan, 1990 to Jan, 1994.

Answer:
Chief of the Army Staff