#define P_S bit(7) /* Spy ability */
#define P_I bit(8) /* Imaging ability (advanced spying) */
#define P_O bit(9) /* Orbital ability (a satellite) */
-#define P_X bit(10) /* Stealth ability */
+/* unused bit(10) */
#define P_N bit(11) /* Nuclear RV interceptor (abm) */
-#define P_H bit(12) /* Half stealthy */
+/* unused bit(12) */
#define P_E bit(13) /* extra light */
#define P_K bit(14) /* chopper */
#define P_A bit(15) /* ASW (Anti-Sub Warfare) */