"The world's oldest extant regiment dates back to the year 1521 when the men of Dalecarlia chose 16 young men as body guards for Gustav Vasa. Since the year 1523 the section, now enlarged, has been known as the Royal Corps of Halberdiers and, under various names, the regiment has had its natural home at the Palace in Stockholm. The Halberdiers were transformed in 1619 into the Household Company which accompanied Gustavus Adolphus wherever he went in Europe. It was from this time too that the unit was classed as a regiment. In 1633 the company brought the king's body home from Lützen and thereafter formed the basis of Queen Christina's new guards regiment within the royal household."
Source: http://www.livgardet.mil.se/article.php?lang=eng&id=1447
Video: http://youtube.com/watch?v=2VJKBSv8A-k&search=Swedish%20Military
Source: http://www.livgardet.mil.se/article.php?lang=eng&id=1447
Video: http://youtube.com/watch?v=2VJKBSv8A-k&search=Swedish%20Military