Lockheed Martin interview questions

I first learned of the position for which I have been hired in early May. I applied for it immediately but did not hear anything back for about a month (early June). This is when a recruiter emailed me and asked me to briefly answer about 10 questions (i.e. Why am I interested in this position?, Why am I leaving my current position?, What related experience do you have?, What salary do you expect?, etc.) A couple days later that same recruiter emailed me that the hiring manager wanted me to come in for an interview. They called a few days later and scheduled the interview for mid-June. The interview consisted of 4 employees and it took about 45 minutes. They asked me some open-ended questions that required quite a bit of explanation about related experiences. They also described the position I would be doing if hired. I felt that the interview went well but I didn't hear anything from them until 11 business days later. This is when they told me they would let me know what their decision would be in another 7-10 business days. I didn't hear from them until mid-July which was almost a month since the interview. HR had emailed me that they were starting the hiring process and that I needed to fill out a "Conflict of Interest" form since I have two family members who work with Lockheed. Three business days later, I received another email from HR that I had received an employment offer. I made a counter offer that same day and heard back from them the next day that they accepted it. HR encouraged me to not resign from my current job yet because they still had to go through security screening (drug testing, background check, credit check, employment verification, salary verification, and education verification) and that it should take 7-10 business days to complete. Near the end of July, I was told that all security screening had been complete, "welcome aboard", and told me that my first date on the job would be in early August.