helicopter training at airport by my apartment

in the past week everyday i have seen a cobra helicopter flying over my apartment about a dozen or more times a day. seems like they must be training for something. i live in Michigan and by the airport is Oakland county international airport. it looks almost identical to this one here link
also the other day there was a black hawk flying around thought its been kinda weird not real weird as selfridge airforce base isn't far away but i think they just fly f-16s and c-130s out of there along with coast guard
selfridfe airforce base info

any thoughts?