Current military laser rangfinders and designators are typically of Nd:YAG, are Q-switched, and operate at an output of 50 to 150 m.j. over the frequency range of 1 to 25 Hz. A great deal of emphasis is placed upon efficiency. In this context, a compilation is made of experimental data from various sources concerning the familiar topics of lamp gas, fill pressure, size, envelope material and spectra. Some hypotheses are made to explain the high efficiency typical of operation in the preignited mode and at high pressures. Experimental and analytical determination of the lamp temperature in a conductive cooling mode of operation are presented, and a scheme for reduction of laser pulse jitter in dye Q-switched operation is evaluated.