Is it possible to obtain a Bachelor's Degree in 3 years?

One can. But one had better know their limitations and how much they are willing to live and study HARD with blinders on like a MONK.

Yes, my husband got his bachelor's in mechanical engineering in 3 years at Penn State.

It is possible to do a 4-year bachelor's in less time. I did it in 2-1/2 years at a highly competitive & one of the more demanding university while working full-time. However, you are seriously off on the wrong foot. An associate's degree at a community college (never a demanding program) normally takes 2 years and fulfills general education requirements for the average university. Now you're not going to get enough credits, especially completing requirements for your major and advanced courses, by spending too long in community college. Trying to transfer mid-year is always a bad idea, but especially so for foreign students. Plus you did not plan ahead properly and apply in time for a transfer. Remaining in community college another semester or another school year is a waste of time & money. It's just going to take you longer to complete degree requirements. The 4-yr school might not even transfer all your community college credits simply because they are low-level & intro courses, not the advanced courses for junior & senior year. At this rate, you have problems with your student visa, taking too long to do an associate's degree, and you can still expect to need another 2 years of work toward your bachelor's. Community college for an associate's, plus finishing a bachelor's at a 4-year university, should not take longer than 4 years total, if you are attending school full-time as required for all foreign students. You've really fouled up here.