Mercenaries .... i guess you are confusing the term with regular army !!!! Just becuase an army of a country takes money from another country it does not make them mercenaries...... coming back to the topic.
Indian ex servicemen were sought after by the US forces as they are known for their profesionalism ....... hence ex servicemen were actively recruited by US forces in Iraq.
However there was no involvement of Indian army in Iraq ...... India was keen to send its troops to Iraq but only under a UN sanctioned peacekeeping mission. And as history has shown us it never happened and hence there was no Indian troops in Iraq !!!!!
Playing with symantics are we :D