Congratulations on your upcoming fifth wedding anniversary. Also, thank you for your service to our country. As MyBelovedNYC10036 has pointed out $2,000 is not a lot of money to do a wedding vow renewal with 200 guests. I agree with MyBelovedNYC10036 that working with a religious institution or a friends property is probably a very good option for you. Another option would be to check on using a school facility or a public park.
Considering your budget you may want to consider doing everything as a family/friends/community project from preparing the food to doing the decorations. With very careful budgeting (and choosing a venue such as a very cooperative friends property or a religious institution) you may be able to pay your clergy person, an organist or other musician affiliated with your religious institution and buy supplies to make decorations and uncooked food ingredients to feed 200 for close to your budget. Your challenge will be to have an enjoyable time in the family/community effort to prepare for your very special event. While I normally recommend hiring a photographer as a top priority, in this case you may be best off asking a couple of family members who have demonstrated talent in taking photos of people in the past to help out as a good photographer would probably charge most of your budget, if not more.
If you go the family route, don't expect everything to be "letter perfect." Just aim to have a meaningful and enjoyable day no matter what glitches come up. Take lots of photos and videos and simply enjoy what goes right and what ends up not working as planned too.
While I appreciae the other guest's point of view about waiting until you have more money, I would not want to make this recommendation, especially if your dad (or other friend or family member) is not well.
Ronald G. Shapiro, Ph. D.Education By Entertainment