Officials have to be encouraged at the trend toward a safer on- and off-duty Navy, indicated by near-mid-year Naval Safety Center statistics. We type those words with a big “knock on wood,” of course. But with the fiscal year — which began Oct. 1 — nearly halfway gone, it’s looking like the Navy is shaping up, safety-wise — at least in terms of major mishaps, and on- and off-duty deaths. Check the trends for the fiscal year through March 23, referred to in the following as “at this point”: Class A afloat mishaps: two this year compared to four a…