The suicide rate for veterans of the iraq and afghanistan wars is the general population.

The suicide for the veterans of the Iraq and Afghanistan wars is 38/100 000 which is probably higher versus 11.5/100 000 in general population. The main cause of suicide is the post dramatic stress disorder where 30% of the population is believed to suffer from the disorder. 6000 veterans committed suicide in 2009 while 22 veterans commit suicide everyday and this is 20% of all the suicides and those who commits the suicide mostly are the male of 50 years and above.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .