Is my memory off, I recall 1Cr = an hour of unskilled labor (US minimum wage), @1979 that was about $3.00US? In the mid 1980s when they refigured things the minimum wage was running @5.00US.
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As for the actual military forces of planets I think manpower is a better way to assign things than cost of equipment. First, military materiel in Traveller, by all indications, has absurdly long service lives - buy 25 grav tanks a year and in 20 years you can field an armored division. Second, since cheap weapons exist to equip troops there is no practical reason not to create a "Urban Defense Division" with SMGs if the manpower is available.
The percentage of the population devoted to the military will vary due to many factors but we can generalize that over 2% is probably wartime mobilization (not necessarily at war) and .1% is effectively disarmed (the Treaty of Versailles was considered to have disarmed Germany with an army limited to .18% of it's population). Of the military a fair amount will not be combat people*, above tech 6 there will be, give or take, 9 non-combat persons for every combat person.** Apply whatever factors you think are reasonable to determine where a given planet stands, a balkanized planet in the Spinward Marches which was invaded in the 5th Frontier War will almost certainly devote more of it's population to the military than a gov code 0 world in the Core which hasn't seen a war in 9 centuries.
Also, I like the 4 per 100,000 / 1 ship's crew per 100,000 population because it is such an easy number to work with. Sure you can sit down and make all kinds of calculations based upon government type, stellar location, tech level, psychological makeup of the population and whatever else you want to throw in, but there is a nice simplicity to my system which allows the creation of the general outlines of a military on the fly.
*people is used because of the various way that have been found to confuse military and non-military positions. have technical civilians do all of the support jobs and you can shrink your "military" while still devoting the same fraction of the population to military service. have "civilian instructors" drive tanks onto the battlefield and fly planes in combat and you can shrink your nominal military even more.
**the various Traveller systems don't make this "logistics tail" grow with tech. different models of future military make this ratio change as tech advances until at very high tech you need 1000 support people for every fighting person. I think this is more realistic than the Traveller system but if we take Traveller as it is then the 9:1 ratio is what we wind up with.
