P_X and P_H were removed in commit
61233e4, v4.3.23.
Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
(see info satellite)
.L satellite
a satellite - stays in orbit until shot down
-.L stealth
-a stealth plane - has a chance of not triggering intercepts
.L SDI
Intercepts tactical missiles.
-.L half-stealth
-a stealth plane - has a smaller chance of not triggering intercepts
.L x-light
xtra-light, can be carried and used on any ship or land unit with a non-zero
xl capacity. (see info Ship-types)