Conscripts serving their obligation (usually from 9 months to 2 years) are counted into Active numbers. Reserves are those, that already served and now are living a civilian life, being liable to recall if needed.
As for the size of Your armed forces being comparable to Hellenic Armed Forces...
You wrote: Military size (...) Total Active: 175,000, Reserves (...) Total Reserve: 87,500 + Conscripts (275,000-295,000).
Well, it either makes no sense, or these armed forces are not comparable to HAF.
If You meant 175,000 career soldiers (officers, NCO's, extended-duty privates) PLUS 275,000 conscripts serving their active duty obligation at any given time, then, with 450,000 men under arms Your Armed Forces aren't the size of HAF, but some 2,5 times larger (and in turn those 87,500 reserves would be pathetically small - effectively it means, that there's no recall obligation).
On the other hand, if You mean, that at any given time there are 175,000 soldiers under arms (regulars and conscripts), then You just add those 87,500 "reserves" and 275,000-295,000 "conscripts" and get some 370,000 reserves.
According to The Military Balance 2010 by The International Institute of Strategic Studies, HAF at the time had total strength of 156,600 soldiers, including some 50,500 1-year conscripts (and 100,100 career soldiers) plus reserves of 237,500 (former career soldiers and former conscripts).
Note, that HAF are actually going towards mostly volunteer army.
In the 1990-1991 (according to that years Military Balance) HAF had 162,500 active soldiers, including 126,800 2-year conscripts, plus reserves of some 406,000.
In the 1990 Hellenic Army had 10 Infantry Divisions, 1 Para-Commando Division, 7 Armored/Mechanized Brigades (with 2 umbrella Division HQ's), 1 Marine Brigade, plus a Territorial Army for coastal and island defence (13,250 cadre, some 17,000 active-duty conscripts and 120,000 reserves - counted in that grand total of 406,000) with around of 100 infantry batallions (of that about 20 active and 80 reserve). And on top of it, of course support (corps-level artillery, air defence, engineers, army aviation, signals, medical service, logistics, training establishments, staffs and administration).
In conscript militaries units are kept at various levels of readiness - starting from units in high readiness, that could go to war almost immediately, to units that are fully reserve, with no or almost no active personnel.
Hellenic Army in 1990 had units in 3 categories: A - 85% (and more) fully ready, B - 60% ready in 24 hours, C - 20% (or less) ready in 48 hours.
In category A - 2 Infantry Divisions, 1 Para-Commando Division, 7 Armored/Mechanized Brigades, 1 Marine Brigade, 2 Brigades/Regiments of Territorial Army'
In category B - 3 Infantry Divisions, 4 Regiments of Territorial Army;
In category C - 5 Infantry Divisions, all remaining Territorial Army (those 80 bns).
Full strength of an average division is usually between 12,000-18,000 soldiers. But remember, that modern armies have very long "tail", meaning support formations. US Army has probably longest tail of all and had in 2010 10 active and 8 National Guard divisions with a strength of about 550,000 active and 360,000 ArNG (that gives a statistical total of 50,000 soldiers per one division, with only about 15,000 in the division itself and 35,000 elsewhere).
For other armies You can assume, that in average fully mobilized army You'll have no better than 1:1 ratio that is for 10,000 soldiers in front-line units You'll have another 10,000 in support.
As for the equipment. And those 1300-3000 tanks. What is the geographical location of Your country? Do I understand correctly, that it's an island? In that case You don't need even those 1300 tanks. And 3000 tanks for army of 170,000 active/540,000 war establishment is a high number. That's an army that expects large tank battles and in real world could be seen only in Central Europe during Cold War and Middle Eastern countries expecting Israeli-Arab war (Israel, Syria, Egypt, Saddam's Iraq).
NATO-style armored division would have around 15,000 soldiers, some 240-350 tanks, some 200 AIFV's, about 100 howitzers and MRLs, about 50 mortars plus air defence, anti-tank weapons and several thousand support vehicles. (in Mechanized division proportions of tanks and AIFV's would be more-or-less reversed and would need more soldiers due to more infantry).
Soviet armored division in the 80s had about 10,000 soldiers (full strength), some 320 tanks, some 180 AIFV's and APC's, about 120 howitzers and 18 MRLs, about 36 mortars plus strong air defence etc. Motor-rifle division would have about 14,000 soldiers, some 210 tanks, some 300 AIFV's etc.
If You have any questions You can ask them here or PM me.
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