Although they're not going to reveal trade secrets in great detail, you want to look for books by Peter Stiff.
I have the ISBNs for the following: -
"See You In November" ISBN 0 94702 026 8
"Selous Scouts Top Secret War" ISBN 0 620 06674 1
The last book was written by Stiff from the words of Lt.Col. Ron Reid Daly.
Other books include: -
"Tommy Goes Home"
"Selous Scouts - A Pictorial Account"
"Taming The Landmine"
Publication was typically in the 1980s so these books are probably best located through places like Amazon,
ALibris or
AbeBooks