442 a
Left to right, are James A. Lovell Jr., Commander (CDR); John L. Swigert Jr., Command Module Pilot (CMP); and Fred W. Haise Jr., Lunar Module Pilot (LMP).
They were photographed for an official portrait the day before liftoff as they made a pause during the busy pre-launch activity.

Astronaut Ken Mattingly, until a few days before the mission, was the prime Command Module Pilot for the mission and due to exposure to measles, was replaced by Jack Swigert.

442 b
[NASA caption] The Apollo 13 mission is targeted to land in the Fra Mauro region, south east of the Ocean of Storms, to perform selenography inspection, survey, and sampling of the lunar surface, to deploy and activate the ALSEP package, obtain photographs of candidate landing sites and to develop man’s capability to work in the lunar environment.

The astronauts practice lunar surface activities near the LM.

The Apollo Tool Carrier with a 16mm movie camera and a lunar map is visible near an astronaut wearing his chest-mounted Hasselblad camera (second photograph).

A Hasselblad lunar surface camera and a 16mm movie camera are visible on the LM footpad (first photograph).

442 c
James Lovell and Fred Haise are pictured in a walkthrough of the extravehicular timeline in the
vicinity of the Flight Crew Training Building at the Kennedy Space Center. Unfortunately they never had the opportunity to walk on the Moon.

442 d
The Hycon camera was a high resolution reconnaissance camera intended to be used by Swigert to photograph the lunar surface in higher definition than was possible with the Hasselblad cameras used by the crew. It was designed to be attached to mountings around the Command Module hatch’s circular window, number 3. The most significant advantage of the camera was that it had image motion compensation.

The crew never used the camera due to an explosion en route to the Moon.

From the mission transcript during the translunar coast before the Apollo 13 explosion:

003:57:04 Haise: By the way, the windows came through in real good shape. Window 5 looks real clean, so I’m kind of hopeful that Hycon stuff will be pretty good.

442 e
Seen here during a Countdown Demonstration Test, Apollo 13 prime Command Module Pilot Ken Mattingly was replaced days before the mission by backup crewmember Jack Swigert due to Mattingly’s exposure to measles.

“It was inconceivable to me that they would leave me behind. [...] Turned the radio on and heard this goddam news announcement that says, “NASA announces this afternoon that they’ve had a crew reassignment”. That’s when it became real,” said Ken Mattingly (Chaikin, Voices, p. 137).