What's the estimated number of people in Iran available for military servicein 2005?
399223
Lots.  They have a sizable military.  However, as in the case between the Iran/Iraq war during the early 90s, Iran is capable of recruiting thousands of civilians as religious zealots that don't mind the role of bullet catcher.  Rather scary.  In the past war, they were not given weapons and carried their own death shawls with them.
856512
It looks like about 500,000 to 700,000 according to USA news in 2005.  Tops was 2,873,000 (Vanderjagt).
12621
According to CIA world FactBook, 7,163,506 according to July 2005 estimates. You can read a detailed article on it at the following source :
239809
I think you must go ask Iranians there about it, New rooz has passed but there are about 10 days to sizdeh bidar
171835
estimated world population at time of post 6,593,337,406 as per http://www.ibiblio.org/lunarbin/worldpop\n\nmultiplied by ten = 65,933,374,060\n\nthat's my guess
595621
yes you can go to ts site it will give information\n\nhttp://www.dfait-maeci.gc.ca/world/embassies/iran/menu-en.asp
522575
93.5% U235, the balance U238 (US Standard)\n\nDon't tell the Iranians!
9289
297,868,340 \n[16:44 GMT (EST+5) Dec 13, 2005]
1073137
1,306,313,812 (July 2005 est.)
321604
I haven't been able to find any exact numbers, but since you asked for fraction, it's about 1/3 or about 2 billion people.
351532
At this time their are about 1.4 million people who could be considered on active duty.  This number includes ALL of our armed forces.  This does not include reserves, or guard.  That is a mighty small number when you think about our commitments.
776303
Fit for Military Service:\n\nmales age 17-49: 4,810,831\nfemales age 17-49: 4,853,270 (2005 est.)
404163
You are in luck... Iran is the shemale capital of the arab world.  Try searching on urnotalone.com or a similar site and I'm sure you'll find someone.
734674
True. You're pretty close. According to wikipedia, as of late 2006 the population reached 6.5 billion.
455464
Total - Barely over 500,000\nIn Iraq - over 135,00\nOverseas in General (Germany, Italy, Korea, etc) - 328,000\nStateside - 174,000
573573
6,614,912,139 and counting...\nadd another 3 people for every second...\n\nPopulation estimation in 1 January 2007:\n6,676,783,229
866914
I can't give you an exact date, time, or anything, but if nothing short of revolution happens in at least 20-25 years, either it's overdue or 90% of Iranians love their Islamic fundamentalist overlords.