Friend, you are either living in a fools paradise or are totally unaware of the ground realities -- we cannot even afford to send our kids to school let alone buy and maintain a carrier group! 45+% of our population are living below US$1 a day and we are talking about rescuing Nigeria and Sudan!!!!!!
We should not dream of becoming regional policemen unless we get our house in order first! We are already supporting an armed forces structure which is way beyond our current means.
Let us use this money (If we have this money for arguments' sake) on building education institutes of excellence and produce engineers, scientists, economists to get us out of this mess.
We can all act like a recalcitrant kids but the reality would not change -- we should concentrate on our economy -- be a world economic power - and think about being the "Knight in shining amour" for the regional countries after we achieve economic freedom.
All those countries that are quoted by you who have a/c carriers are either developed and have overseas dominions/islands to protect, or are fast becoming developed. Even than we have the case of Japan, Germany, Singapore, Malaysia, Indonesia etc. that are developed -- have a definite need for safe-guarding their trade but have not opted for the ACG's and worked their way around this problem by forging alliances through interntional politicking/diplomacy.
Have you ever thought that why USSR never had a carrier group of any repute during its 50 odds years of existence or for that matter the Chinese???? USSR has a relatively smaller coast with inland seas and oceans/seas that are blocked off during winters, contiguous borders with its important trading partners, and vast oil reserves. They really did not need a ACG until they started projecting power in and around Africa. The economic survival/dependencies dictate power projection priorities.
I do hope that your "Dreams" get fulfilled but be very realistic when discussing things on such types of forums/communities, it directly reflects upon your image on the forum my friend. I hope you will not take my comments negatively -- they are not intended to be negative but are an attempt to provoke a different thought process in you. You seem to have a fire inside you that needs to be channelised. Take care