Theme:
20. Ship that's safe for an ocean voyage : SEAWORTHY VESSEL
37. Barrel roll or wingover : AIRSHOW MANEUVER
48. Brown v. Board of Education of Topeka, for one : LANDMARK VERDICT
62. With 65-Across, military specialist : NAVY
65. See 62-Across ... and an acronym of the starts of 20-, 37- and 48-Across : SEAL
Melissa here. Got hung up in a few spots today. WOW, what a clever and patriotic theme, which didn't dawn on me until 62A and 65A were filled in. Three grid-spanning theme answers with the two reveals perfectly placed in the southeast corner - very impressive. From Wikipedia: "The SEALs are trained to operate in all environments (Sea, Air, and Land) for which they are named."
Across
1. "Big bad" pig harasser : WOLF
5. Paper Mate products : PENS
9. Dictation pro : STENO
14. Milky gem : OPAL
15. Frenzied : AMOK
16. High fly to the shortstop : POPUP
17. __ and dine : WINE.
18. Optimistic : ROSY
19. Wear down : ERODE
23. Teller of macabre tales : POE
24. Tokyo, once : EDO
25. Student's assignment : REPORT
29. See 47-Across : BIGS. All perps.
31. Indy 500 stat : MPH
34. Nebraska city near Boys Town : OMAHA
35. O'Hara plantation : TARA
36. Pepsi, e.g. : COLA. Tried SODA first.
40. Award for 46-Down : CLIO
41. Apron tops : BIBS
42. Stair part : TREAD
43. "For __ a jolly good fellow ... " : HE'S
44. Long skirt : MAXI
45. Conceited : CHESTY. If you say so.
46. Objective : AIM
47. With 29-Across, baseball's major leagues, in slang : THE. I suppose the baseball fans knew this right off the bat. Me, not so much.
57. San Antonio mission : ALAMO. Surprisingly small in person.
58. The "kid" in "Here's looking at you, kid" : ILSA
59. "I smell __!" : A RAT
60. "Homeland" actress Claire : DANES
61. Trio minus one : DUET
63. Supremes singer Ross : DIANA
64. CPR pros : EMT'S
Down
1. Bowls over : WOWS
2. Mayberry tyke : OPIE
3. Turner of "The Postman Always Rings Twice" (1946) : LANA
4. Took to the sky : FLEW
5. Stereotypical cracker requester : PARROT
6. Chew the scenery : EMOTE
7. Grab a bite : NOSH
8. Grey Goose rival : SKYY
9. Takes chances with a radar trap : SPEEDS
10. Art class form : TORSO
11. Long verse : EPOS. What?
12. Sans clothing : NUDE
13. German automaker : OPEL
21. Daytime TV mogul : OPRAH
22. One who shuns all animal products : VEGAN
25. Raid victim : ROACH. Nice clue.
26. Writer Zola : EMILE
27. Eiffel Tower city : PARIS
28. Extremely : OH SO
29. Disney deer : BAMBI
30. Investments for the future: Abbr. : IRAS
31. Relocates : MOVES
32. Accordion fold : PLEAT
33. "Tess of the d'Urbervilles" author Thomas : HARDY
35. Candy sold in pairs : TWIX
36. Restore to health : CURE
38. 44th president : OBAMA
39. Bygone anesthetic : ETHER
44. Brunch cocktail : MIMOSA
45. Doesn't play fair : CHEATS
46. Madison Ave. figures : AD MEN
47. RCA product : TV SET
48. TV "angel" Cheryl who replaced Farrah Fawcett : LADD
49. Jai __ : ALAI
50. Gram : NANA
51. Hitchhiker's hope : RIDE
52. Model Heidi : KLUM
53. Dapper fellows? : DANS
54. "Dies __": hymn : IRAE
55. Vena __: major blood line : CAVA
56. Texter's sign off : TTYL