Years ago, when I was still kicking in doors for a living, serving search and arrest warrants and chasing dopers of various sizes, shapes, and ethnic origins, I began keeping a book of personal debriefs.  I did this because I cared deeply about — and still train scrupulously in my civilian incarnation — small unit tactics.  When I was in the big leagues – the regional Narcotics Task Force — I was generally number one through the door on warrant services, which is both an art and a skill, and in every case extremely dangerous because one never knows what awaits on the opposite side, and also because narcotics enforcement is not synonymous with good tactics.