The K/L/M fits were the NATO codes to enable all AD ac to operate anywhere and just check-in with their TyCo (+ weaps + fuel capabilities). For a long time classified, the use of TyCos across NATO stopped (officially at least) when the document containing them was withdrawn (well before the OSD of the F3) - its replacement simply didn't have them, but the CRCs still used them. The following list is quite old now:
A. F16 Clean
B. F16 Centreline Tanks
C. F16 Wing Tanks
D. F16 Centreline + Wing Tanks
E. F14
F. F18
G. Hawk
H. F5 Clean
I. F4F
J. SHAR 2 x 90Gal Wing Tanks
K. F3 Clean
L. F3 2 x 2250 litre Wing Tanks
M. F3 2 x 1500 litre Wing Tanks (ferry)
N. F15C Clean
O. F15C Centreline Tanks
P. F15C Wing Tanks
Q. F15E Conformal Tanks
R. F3 1 x 1500 litre Centreline Tank
As I say, obsolete for some years now, hence nothing about Typhoons etc.
STH