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An excerpt from Programmable Hand-Held Calculators in the Operating Forces of the Marine Corps, Naval Postgraduate School, Maser's Thesis, DTIC-ADA110793, MAR 1981, 103 pgs.

"ABSTRACT
    This thesis provides usage and cost data on programable hand-held calculators (PHHC's) in the operating forces of the U. S. Marine Corps (USMC) … In February 1981 Naval Air Systems Command began reviewing a proposal to provide a PHHC for the CH-53E … systems is described, and available cost information is analyzed. In order to do their jobs faster and more accurately, several individuals have written or purchased software for their personal PHHC's … examples which have application in the USMC are presented and explained.
…
                III. FORMAL PROGRAMS UNDER DEVELOPMENT
A. AVIATION APPLICATION
    1. The Marine Corps/Navy CH-53E Heavy Lift Helicopter Naval regulation requires that certain categories of transport aircraft be provided with a system for calculating center of gravity under all possible load conditions. In the past this has been accomplished by procuring, at considerable cost, a specially designed slide rule. In May of 1980 Naval Air Systems Command requested that Sikorsky Aircraft submit an engineering change proposal to the CH-53E procurement contract which would substitute a PHHC for the center-of -gravity slide rule. The request stated, "Electronic calculators are available for approximately the same price as the MIL-C-6092A balance computer." [Ref. 11] A CH-53E calculator similar in function to the AV-8A calculator would be able to do certain performance calculations in addition to the center-of-gravity computations because the latter would only use a portion of the 5000 steps available in a TI-58 module.
    The Sikorsky proposal probably would have been quickly submitted except for one development. That development was Hewlett-Packard's newest PHHC, the HP-41C. Its enhanced alphanumeric capability, increased storage capacity, and constant memory caused Sikorsky and Naval Air Systems Command to agree that Sikorsky should take the additional time necessary to evaluate this new PHHC and how it could be employed in a flight planning decision support system role for the CH-53E. Accordingly, Naval Air Systems Command now expects Sikorsky will, during February of 1981, submit two proposals: one for using a TI-58 and one for using an HP-41C. Naval Air Systems Commmand will evaluate both proposals and will select the one with the higher benefit-to-cost ratio."
pgs. 29-30

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