QUOTE(FITZ @ Wed 5 Dec 2007 1338)

That is exactly what I needed. Thank you.
While I am at it, I also found this article on my HD (published in
Field Artillery Magazine, October 1988 Issue, page 30) :
QUOTE
M113 Unsafe for Amphibious Training
The US Army's M113 armored personnel carrier (APC) and its derivatives have been declared unsafe for peacetime amphibious training. The ban applies to most of the US Army's M113 force of nearly 26,000 vehicles, including the 13,000-strong troop carrier force. The M113 is one of the world's most prolific armored vehicles, with more than 75,000 in service with the armed forces of 41 countries.
A spokesman for the Tank Automotive Command (TACOM) said the swimming prohibition applies to "all of the M113 vehicles other than air defense type vehicles."
As the M113 has developed, its weight has increased from about 10,660 kilograms (kgs) with full combat load to 12,250 kgs in the later M113A3 types. With additional external armor, the M113A3's weight rises to 14,000 kgs. The M113A3 has been banned from swimming since it entered service in 1986.
While a review of the amphibious capability is now under way at the Army's Training and Doctrine Command at Fort Monroe, Virginia, the problem may be overcome best by simply eliminating the M113's need to be amphibious. "We're looking at ways to restore the swim capability," said a US Army public affairs spokesman at the Pentagon. "But first, we want to know: does it have to swim? What is the point in spending the money to make it swim again if we're not going to ask it to do that?"
Courtesy of Jane's Defence Weekly, 12 March 1988, p. 435