Seek balance in your training for long term career goals. No department seeks a chief or a commander that is too focused in one topic. The leaders of tomorrow must be balanced and well versed in all law enforcement topics. You must seek a variety of topics in your training.
Do not sit and wait for the department to send you on their dime. You are investing in your future. I can recall attending training on my days off, taking comp time and even paying for my own tuition to attend. If it is important to you, go. This may send a message to your commander: that you are willing to invest your own equity into yourself. Maybe next time if the decision is between you and the marginal performer, you will be their selection.