ATC: (Tomcat?) 2968, uh, reduce speed now to decimal 7 4, and on transition 2 5 0 knots.
Pilot: ____ decimal 7 4 and transition 250 knots, (Tomcat?) 2968
The ".74" is mach speed (mach 0.74). Still can't understand the call sign, though, sorry - maybe "Tomcat"?