How many different season have an Army - Navy score of 10 dec. 2016 at Baltimore, MD (M&T Bank Stadium)?
CREATE TABLE "table1_1850339_2" (
  "season" real,
  "trophy_winner" text,
  "air_force_navy_score" text,
  "air_force_army_score" text,
  "army_navy_score" text
);
SELECT COUNT("season") FROM "table1_1850339_2" WHERE "army_navy_score"='10 Dec. 2016 at Baltimore, MD (M&T Bank Stadium)';